A007642 Numbers k such that 2*k^2 +29 is composite. (Formerly M5205)

29, 30, 32, 35, 39, 44, 50, 57, 58, 61, 63, 65, 72, 74, 76, 84, 87, 88, 89, 91, 92, 94, 95, 97, 99, 102, 107, 109, 113, 116, 118, 120, 122, 123, 125, 126, 127, 134, 138, 144, 145, 146, 147, 148, 149, 150, 153, 154, 156, 157, 163, 164, 165, 166, 169, 174, 175, 179, 180, 182, 183, 185, 187

Offset

1,1

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..63.

Prog

(PARI) isok(k) = !isprime(2*k^2+29); \\ Michel Marcus, Apr 15 2022

Crossrefs

Sequence in context: A210309 A165850 A129287 * A353004 A295749 A022399

Adjacent sequences: A007639 A007640 A007641 * A007643 A007644 A007645

Keyword

nonn

Author

N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v

Extensions

More terms from Michel Marcus, Apr 15 2022

Status

approved