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A124412 Numbers n such that 2n+1, 4n+1, 8n+1 and 16n+1 are primes. 6
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

Table of n, a(n) for n=1..36.

MATHEMATICA

Select[15*Range[3500], And @@ PrimeQ /@ ({2, 4, 8, 16}*# + 1) &] (*Chandler*)

CROSSREFS

Cf. A005097, A123998, A124041, A124413-A124417.

Sequence in context: A262353 A188402 A139674 * A280972 A158126 A124413

Adjacent sequences:  A124409 A124410 A124411 * A124413 A124414 A124415

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 02 2006

STATUS

approved

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Last modified May 27 11:51 EDT 2017. Contains 287205 sequences.