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A152145 a(n) = least k such that 3*k*2^n-1 or 3*k*2^n+1 (or both) is prime. 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 2, 1, 1, 3, 3, 3, 4, 2, 1, 9, 6, 3, 9, 15, 13, 11, 9, 5, 4, 2, 1, 5, 4, 2, 1, 2, 1, 2, 1, 4, 2, 1, 2, 1, 5, 18, 9, 9, 5, 18, 9, 7, 8, 4, 2, 1, 9, 17, 18, 9, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,10

LINKS

Pierre CAMI, Table of n, a(n) for n = 0..1230

CROSSREFS

A152141

Sequence in context: A097526 A051149 A293424 * A288251 A051758 A024553

Adjacent sequences:  A152142 A152143 A152144 * A152146 A152147 A152148

KEYWORD

nonn

AUTHOR

Pierre CAMI, Nov 26 2008, Nov 27 2008

STATUS

approved

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Last modified June 25 03:50 EDT 2019. Contains 324338 sequences. (Running on oeis4.)