A114056 Numbers k such that 2^prime(k) - 1 + 10^k is prime.

1, 2, 3, 7, 8, 222, 227, 360, 535, 2713, 9079

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Example

7 is there because the 7th prime is 17 and 2^17-1+10^7 is prime.

Mathematica

Position[PrimeQ[Table[(2^Prime[n] - 1) + 10^n, {n, 10}]], True]

Crossrefs

Sequence in context: A103173 A098863 A053960 * A168222 A323384 A349641

Adjacent sequences: A114053 A114054 A114055 * A114057 A114058 A114059

Keyword

nonn,more

Author

Joao Carlos Leandro da Silva (zxawyh66(AT)yahoo.com), Feb 02 2006

Extensions

Edited by Don Reble, Jul 23 2006

a(10)-a(11) from Michael S. Branicky, Apr 15 2023

Status

approved