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A105290
Numbers k such that prime(k+1) == 4 (mod k).
8
1, 3, 11, 13, 69, 71, 637225, 637253, 637313, 637327, 4124459, 4124685, 27067033, 179993017, 179993023, 1208198853, 8179002097, 8179002109, 55762149091
OFFSET
1,2
COMMENTS
Integers k such that A004649(k+1) = 4. - Michel Marcus, Dec 30 2022
PROG
(PARI) my(n=0, p=2); while(n++, (-4+p=nextprime(p+1))%n || print1(n, ", ")) \\ M. F. Hasler, Feb 05 2009
KEYWORD
nonn,more
AUTHOR
Zak Seidov, Apr 25 2005
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
STATUS
approved