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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

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,changed

AUTHOR

Artur Jasinski, Nov 02 2006

STATUS

approved

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Last modified April 6 08:44 EDT 2020. Contains 333268 sequences. (Running on oeis4.)