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A124413 Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes. 3
765, 3420, 7695, 8325, 16650, 22185, 28995, 33300, 41715, 52935, 72510, 75075, 82950, 99810, 104715, 106425, 115620, 121275, 145635, 159840, 165900, 173070, 188745, 190815, 192795, 222870, 225705, 239400, 240510, 253395, 253890, 256410 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[15*Range[20000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32}*# + 1) &] (* Ray Chandler, Nov 21 2006 *)
CROSSREFS
Sequence in context: A124412 A280972 A158126 * A319741 A329757 A127206
KEYWORD
nonn
AUTHOR
Artur Jasinski, Nov 02 2006
STATUS
approved

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Last modified June 19 19:50 EDT 2024. Contains 373507 sequences. (Running on oeis4.)