A226747 Difference between the smallest 10^n-digit Sophie Germain prime and 10^(10^n - 1).

1, 289, 44239, 2222239, 114862711

Offset

0,2

Links

Table of n, a(n) for n=0..4.

G. L. Honaker, Jr. and Chris Caldwell, 10000...44239 (100-digits)

Eric Weisstein's World of Mathematics, Sophie Germain Prime

Mathematica

lst = {}; Do[s = 10^(10^n - 1); n = NextPrime[s]; While[! PrimeQ[2*n + 1], n = NextPrime[n]]; AppendTo[lst, n - s], {n, 0, 2}]; lst

Crossrefs

Cf. A005384.

Sequence in context: A296404 A156161 A114762 * A260866 A252360 A125249

Adjacent sequences: A226744 A226745 A226746 * A226748 A226749 A226750

Keyword

base,hard,more,nonn

Author

Arkadiusz Wesolowski, Jun 16 2013

Status

approved