A105290 Numbers k such that prime(k+1) == 4 (mod k).

1, 3, 11, 13, 69, 71, 637225, 637253, 637313, 637327, 4124459, 4124685, 27067033, 179993017, 179993023, 1208198853, 8179002097, 8179002109, 55762149091

Offset: 1

Author

Zak Seidov, Apr 25 2005

Keywords

• nonn
• more

Comments

Integers k such that A004649(k+1) = 4. - Michel Marcus, Dec 30 2022

Crossrefs

Cf. A023144, A092044.

Cf. A004649, A105286, A105287, A105288, A105329, A105451.

Programs

PARI

my(n=0, p=2); while(n++, (-4+p=nextprime(p+1))%n || print1(n, ", ")) \\ M. F. Hasler, Feb 05 2009

Extensions

Missing first two terms inserted by M. F. Hasler, Feb 04 2009

a(11)-a(13) from M. F. Hasler, Feb 05 2009

a(14)-a(15) from Sean A. Irvine, Nov 25 2010

a(16) from D. S. McNeil, Nov 25 2010

a(17)-a(19) from Charles R Greathouse IV, May 05 2011