A124415 Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1, 32*k+1, 64*k+1 and 128*k+1 are primes.

8325, 82950, 884220, 1120470, 3441690, 5627895, 5765505, 7664745, 7757430, 8555040, 10739505, 11891625, 15514860, 15623475, 18268455, 22631970, 24833775, 27373410, 29342895, 31286970, 31577205, 50077455, 51541035, 58646520

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..1000

Mathematica

Select[15*Range[4000000], And @@ PrimeQ /@ ({2, 4, 8, 16, 32, 64, 128}*# + 1) &] (* Ray Chandler, Nov 21 2006 *)

Crossrefs

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

Sequence in context: A170778 A062852 A124414 * A233954 A224465 A049357

Adjacent sequences: A124412 A124413 A124414 * A124416 A124417 A124418

Keyword

nonn

Author

Artur Jasinski, Nov 02 2006

Extensions

Corrected and extended by Ray Chandler, Nov 21 2006

Status

approved