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A124412 Numbers k such that 2*k+1, 4*k+1, 8*k+1 and 16*k+1 are primes. 7
765, 1065, 1155, 1530, 3105, 3420, 3705, 5160, 6840, 7695, 8325, 9060, 11265, 11505, 12195, 14835, 15390, 15885, 16650, 17655, 20745, 22185, 23205, 27300, 28155, 28995, 30165, 30690, 33300, 33825, 39015, 41715, 42690, 44370, 48465, 49935 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[15*Range[3500], And @@ PrimeQ /@ ({2, 4, 8, 16}*# + 1) &] (* Ray Chandler, Nov 21 2006 *)
CROSSREFS
Sequence in context: A156395 A188402 A139674 * A280972 A158126 A124413
KEYWORD
nonn
AUTHOR
Artur Jasinski, Nov 02 2006
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)