A171735 Numbers n such that 10^n*(2+7*10^n)+7 is prime.

1, 2, 4, 19, 25, 47, 266, 2016

Offset

1,2

Comments

No more terms up to n=7500.

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) is(n)=ispseudoprime(10^n*(2+7*10^n)+7) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A153691 A184308 A268338 * A201379 A056727 A154140

Adjacent sequences: A171732 A171733 A171734 * A171736 A171737 A171738

Keyword

more,nonn

Author

Jason Earls, Dec 17 2009

Status

approved