A124413 - OEIS

A124413

Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes.

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

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OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[15*Range[20000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32}*# + 1) &] (* Ray Chandler, Nov 21 2006 *)

CROSSREFS

Cf. A005097, A123998, A124041, A124412-A124417.

Sequence in context: A124412 A280972 A158126 * A319741 A329757 A127206

Adjacent sequences: A124410 A124411 A124412 * A124414 A124415 A124416

KEYWORD

nonn

AUTHOR

Artur Jasinski, Nov 02 2006

STATUS

approved