Explanation:

The first seven primes space 2, 3, 5, 7, 11, 13, and also 17. Don"t forget around 2, the the smallest prime number, and also the only also prime! adding these seven numbers provides a amount of 58, and also 58/2 = 29.

You are watching: What are the first 20 prime numbers     Explanation:

There are 8 feasible numbers; 4,6,8,10,12,14,16,18.

One is not a element number, so just 8, 10, 12, 14, 16, and also 18 can be the amount of two various prime numbers.

Define a collection of consecutive element numbers to it is in a collection of numbers, each prime, in which there room no other prime numbers between them. These room not have to consecutive numbers themselves. Because that example, the numbers 5,7 and 11 room consecutive prime numbers, although they space not continually numbers.

If is the first number in a collection of prime numbers, i beg your pardon of the following might not be the worth of the last number in the series?

Explanation:

The primes, in order, are:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, ...

We produce a few series: -> collection length 2: 2,3 -> series length 3: 3,5,7 -> collection length 5: 5,7,11,13,17 -> collection length 7: 7,11,13,17,19,23,29

etc.

We deserve to then check out that, that the answers, just 47 and 31 remain maybe correct answers. Now we need to decide i beg your pardon of those two space impossible.

We might do an additional series, but the collection has 11 terms requiring us to walk further and further up. If we carry out this, we"ll discover that it terminates in ~ 47, an interpretation that 31 need to be the correct answer.

Another way, however, is to notification that 29 is the end of the series. Because 31 is the an extremely next prime number, if we begin on 11, the series that terminates in 31 would have to have length 7 together well. Every series after will thus end on a number bigger than 31, meaning we will certainly never end up on a 31.

Report an Error

### Example concern #4 : element Numbers

If is a prime number, how plenty of factors does have? Explanation:

The worth of , or , is the product of and also , for this reason it will certainly be divisible by 1, p, p, and nothing else (we know that the p’s room not divisible since they space prime). Because of this p2 has exactly three factors.

(Alternatively, we deserve to plug in any kind of prime number because that p and see how countless factors p2 has. Because that example, if p is 3, climate the factors of p2, or 9, are 1, 3, and also 9.)

Report one Error

### Example question #1 : prime Numbers

The sum of 4 consecutive integers is 210. Which among these four integers is prime?

49

57

53

47

51

53

Explanation:

Let x stand for the smallest of the 4 numbers.

Then we can collection up the adhering to equation:    Therefore the four numbers are 51, 52, 53, 54. The only prime in this list is 53.

Report one Error

### Example concern #6 : element Numbers

Which number is prime? Explanation:

A element number is a number with factors of one and also itself.

Let"s shot to uncover the factors.     It might not be easy to watch as a composite number, but if you recognize the divisibility preeminence for which is dual the last digit and also subtract indigenous the rest , you will certainly see is not prime.

Report one Error

### Example inquiry #1 : prime Numbers

Which is the the smallest prime number? Explanation:

The smallest prime number is actually  is no a prime no one a composite number. The is a unit.

Report one Error

### Example inquiry #1 : prime Numbers

Which that the complying with is a element number? Explanation:

A element number is a number with factors of one and also itself.

Let"s shot to uncover the factors.     It might not be basic to see as a composite number, but if you know the divisibility rule for which is double the last digit and subtract native the rest , you will see is no prime. The divisibility dominance for is include the exterior digits and also if the amount matches the sum then it is divisible . The divisibility dominance for is if the digits have actually a amount divisible by , climate it is . All even numbers are composite numbers through the exception of . So through these analyses, prize is Report an Error

### Example concern #9 : prime Numbers

Which that the following is no prime? Explanation:

Since all of the digits don"t include to a amount of , and also we not see any type of numbers een or finish in , let"s try the divisibility ascendancy for which is double the last digit and also subtract native the rest.

See more: 2000 Ford Expedition Fuse Box Location, Ford Expedition (Un93 1997     Only is divisible by and is no prime and also therefore our answer.

Report one Error

### Example inquiry #10 : prime Numbers

What space the very first three element numbers? Explanation:

The the smallest prime number is actually  is no a prime no one a composite number. The is a unit. This will remove the options with a in them. The following prime number are   is a perfect square and has an ext than 2 factors .

Report one Error
← previous 1 2 following →
view SAT mathematics Tutors
bill Certified tutor
SUNY empire State College, Bachelors, basic Sciences, Theater.
check out SAT math Tutors
Cole Certified tutor
view SAT math Tutors
Liban Certified tutor
Emory University, Bachelor that Science, Mathematics/Economics.

### All sat Math sources

16 Diagnostic exam 660 exercise Tests inquiry of the work Flashcards find out by principle
SAT math Tutoring in peak Cities:
Atlanta sat Math Tutoring, Austin sat Math Tutoring, Boston satellite Math Tutoring, Chicago sat Math Tutoring, Dallas ft Worth sat Math Tutoring, Denver sat Math Tutoring, Houston satellite Math Tutoring, Kansas City satellite Math Tutoring, Los Angeles satellite Math Tutoring, Miami satellite Math Tutoring, new York City sat Math Tutoring, Philadelphia sat Math Tutoring, Phoenix satellite Math Tutoring, san Diego satellite Math Tutoring, mountain Francisco-Bay Area satellite Math Tutoring, Seattle satellite Math Tutoring, St. Louis satellite Math Tutoring, Tucson sat Math Tutoring, Washington DC sat Math Tutoring
SAT math Tutors in peak Cities:
Atlanta sat Math Tutors, Austin sat Math Tutors, Boston satellite Math Tutors, Chicago satellite Math Tutors, Dallas fort Worth satellite Math Tutors, Denver satellite Math Tutors, Houston sat Math Tutors, Kansas City satellite Math Tutors, Los Angeles sat Math Tutors, Miami sat Math Tutors, brand-new York City satellite Math Tutors, Philadelphia sat Math Tutors, Phoenix sat Math Tutors, san Diego satellite Math Tutors, san Francisco-Bay Area sat Math Tutors, Seattle sat Math Tutors, St. Louis satellite Math Tutors, Tucson sat Math Tutors, Washington DC sat Math Tutors
Popular process & Classes
Spanish process & class in Seattle, ACT process & great in Washington DC, ACT process & class in Phoenix, GRE courses & great in Los Angeles, SSAT process & great in Philadelphia, ACT process & class in Boston, SAT process & class in Washington DC, GRE process & great in Chicago, ACT process & classes in Philadelphia, SAT courses & class in mountain Diego
Popular test Prep
satellite Test prepare in san Diego, SSAT test Prep in Chicago, ACT check Prep in Phoenix, ACT check Prep in Atlanta, ISEE test Prep in Philadelphia, ACT check Prep in Dallas ft Worth, ACT test Prep in Washington DC, LSAT test Prep in Washington DC, ACT test Prep in mountain Diego, MCAT check Prep in Phoenix
Report an issue with this concern

If you"ve uncovered an concern with this question, please let us know. With the assist of the neighborhood we can proceed to boost our education resources.

Do no fill in this field
* her Name:
* issue Description:
DMCA complaint

her Infringement notification may be forwarded to the party that made the content available or to 3rd parties such as ChillingEffects.org.

you re welcome follow these steps to paper a notice:

you must incorporate the following:

Send your complaint to our designated certified dealer at:

Charles Cohn Varsity Tutors gmbh 101 S. Hanley Rd, Suite 300 St. Louis, MO 63105