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A176249
Least a(n) such that (a*2^n)*((a*2^n)-1)-1 is a Sophie Germain prime
1
3, 1, 5, 1, 71, 63, 5, 31, 35, 469, 209, 15, 33, 9, 105, 607, 1727, 259, 87, 247, 413, 81, 227, 271, 27, 153, 27, 205, 551, 435, 1175, 1195, 141, 109, 609, 19, 377, 1183, 705, 127, 27, 721, 449, 1815, 1143, 1803, 627, 1027, 845, 573
OFFSET
1,1
LINKS
CROSSREFS
Sequence in context: A146378 A166086 A232101 * A083722 A111426 A100576
KEYWORD
nonn
AUTHOR
Pierre CAMI, Apr 13 2010
STATUS
approved