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A114056 Numbers n such that 2^prime(n) - 1 + 10^n is prime. 0
1, 2, 3, 7, 8, 222, 227, 360, 535 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

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 A140221

Adjacent sequences:  A114053 A114054 A114055 * A114057 A114058 A114059

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

Edited by Don Reble, Jul 23 2006

STATUS

approved

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Last modified March 22 04:32 EDT 2019. Contains 321406 sequences. (Running on oeis4.)