A064903 Semiprimes p1*p2 such that p2 > p1 and p2 mod p1 = 5.

133, 329, 403, 427, 623, 721, 781, 817, 917, 1079, 1211, 1241, 1417, 1507, 1603, 1799, 1819, 1897, 1991, 2077, 2191, 2231, 2681, 2779, 2923, 2959, 2983, 3073, 3107, 3269, 3443, 3563, 3661, 4121, 4151, 4169, 4249, 4411, 4427, 4709, 4739, 4837, 5033

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

sp5Q[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]}, Mod[Last[f], First[ f]] == 5]; Select[Range[5500], PrimeOmega[#]==2&&sp5Q[#]&] (* Harvey P. Dale, Aug 12 2014 *)

Crossrefs

Cf. A001358 (p2 mod p1 = 0), A064899-A064911.

Sequence in context: A146181 A105984 A115518 * A259638 A070158 A055940

Adjacent sequences: A064900 A064901 A064902 * A064904 A064905 A064906

Keyword

nonn

Author

Patrick De Geest, Oct 13 2001

Extensions

Name clarified by Sean A. Irvine, Jul 31 2023

Offset changed by Andrew Howroyd, Aug 13 2024

Status

approved