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A226747 Difference between the smallest 10^n-digit Sophie Germain prime and 10^(10^n - 1). 0
1, 289, 44239, 2222239, 114862711 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 1 09:53 EDT 2020. Contains 334762 sequences. (Running on oeis4.)