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A156176
A bisection of A002439.
1
23, 257543, 27138236663, 11828536957233383, 14639678925928297567703, 41393949926819051111431239623, 231969423543894989257690172433129143, 2330640193014931063017585202490874608196263, 38966520031501064708241399303059964064529134680983, 1023409776429490887726960719866571404072100379273323303303
OFFSET
0,1
CROSSREFS
Sequence in context: A122148 A068736 A138763 * A013772 A320442 A034247
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 07 2009
STATUS
approved