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A004627 Divisible only by primes congruent to 5 mod 8. 1
1, 5, 13, 25, 29, 37, 53, 61, 65, 101, 109, 125, 145, 149, 157, 169, 173, 181, 185, 197, 229, 265, 269, 277, 293, 305, 317, 325, 349, 373, 377, 389, 397, 421, 461, 481, 505, 509, 541, 545, 557, 613, 625, 653, 661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

ok[1]=True; ok[n_]:=And@@(Mod[#, 8]==5&)/@FactorInteger[n][[All, 1]]; Select[Range[3000], ok] (* Vincenzo Librandi, Aug 20 2012 *)

PROG

(MAGMA) [n: n in [1..1000] | forall{d: d in PrimeDivisors(n) | d mod 8 eq 5}]; // Vincenzo Librandi, Aug 20 2012

CROSSREFS

Sequence in context: A156679 A190618 A309585 * A066782 A094553 A094079

Adjacent sequences:  A004624 A004625 A004626 * A004628 A004629 A004630

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Offset changed from 0 to 1 by Vincenzo Librandi, Aug 20 2012

STATUS

approved

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Last modified May 18 19:38 EDT 2021. Contains 344002 sequences. (Running on oeis4.)