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A191618 Least a such that (2^n+a)*2^n - 1 is prime. 11
0, 1, 1, 1, 2, 1, 11, 2, 2, 1, 13, 2, 4, 22, 2, 1, 2, 2, 43, 4, 2, 13, 2, 1, 13, 1, 2, 46, 8, 29, 83, 2, 8, 34, 1, 11, 19, 31, 25, 7, 38, 31, 31, 76, 52, 31, 43, 32, 13, 92, 2, 1, 59, 22, 1, 16, 19, 11, 16, 74, 8, 13, 8, 74, 2, 121, 20, 49, 85, 134, 116, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
MATHEMATICA
Table[a = 0; While[! PrimeQ[(2^n + a)*2^n - 1], a++]; a, {n, 100}] (* T. D. Noe, Jun 11 2011 *)
CROSSREFS
Sequence in context: A281350 A252158 A285996 * A306547 A143888 A016546
KEYWORD
nonn
AUTHOR
Pierre CAMI, Jun 09 2011
STATUS
approved

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)