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A127597 Least number k such that k 4^n + (4^n-1)/3 is prime. 1
2, 1, 0, 2, 3, 2, 4, 4, 3, 10, 3, 3, 2, 7, 2, 25, 6, 17, 4, 13, 3, 20, 36, 20, 11, 27, 66, 23, 39, 24, 19, 13, 3, 10, 6, 122, 71, 58, 24, 13, 3, 2, 41, 10, 6, 32, 58, 17, 4, 79, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

MATHEMATICA

a = {}; Do[k = 0; While[ !PrimeQ[k 4^n + (4^n - 1)/3], k++ ]; AppendTo[a, k], {n, 0, 50}]; a (*Artur Jasinski*)

CROSSREFS

Cf. A035050, A007522, A127575, A127576, A127577, A127578, A127580, A127581, A087522, A127586, A127587, A127589, A127590, A127591, A127592, A127593, A127594, A127598.

Sequence in context: A072739 A030399 A128763 * A167749 A104770 A110280

Adjacent sequences:  A127594 A127595 A127596 * A127598 A127599 A127600

KEYWORD

nonn

AUTHOR

Artur Jasinski, Jan 19 2007

STATUS

approved

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Last modified December 8 22:51 EST 2016. Contains 278957 sequences.