Math, asked by nandikabalan9927, 1 year ago

Prime number of form 10n+1 where is n is whole no, n greater than 1

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Answered by medhavmule
16



 Yohan Somu asked in Math
HOW MANY PRIMES ARE OF THE FORM 10n+1, WHERE n IS A WHOLE NUMBER SUCH THAT 1 < OR= TO n < OR = 10???
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 Ajanta answered this
14122 helpful votes in Math, Class XII-Science
the number is of the form 10n+1 , []

10*1+1=11 is a prime number

10*2+1=21 is not a prime number

10*3+1 = 31 is a prime number.

10*4+1 = 41 is a prime number.

10*5+1 = 51 is not a prime number [sum of digits is divisible by 3, thus the number is divisible by 3]

10*6+1 = 61 is a prime number.

10*7+1 = 71 is a prime number.

10*8+1 = 81 is not a prime number.

10*9+1 = 91 is not a prime number. [divisible by 13 and 7]

10*10+1=101 is a prime number.

therefore 7 prime numbers of the form 10n+1 exist. where []

hope this helps you.

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Answered by gkvignesh32
3

Answer:

Step-by-step explanation:

There are 6 prime nos of the form 10n + 1 when n is defined between values 1 to 10.

p(1) = 10*1+1 = 11 which is prime

p(2) = 21 Not prime

p(3) = 31 Prime

p(4) = 41  Prime

p(5) = 51  Not Prime

p(6) = 61  Prime

p(7) = 71  Prime

p(8) = 81  Not Prime

p(9) = 91  Not Prime

p(10) = 101 Prime

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