A071560 Smallest k such that n^4+k^4, n^2+k^2, n+k are simultaneously primes.

1, 1, 2, 1, 2, 1, 10, 3, 10, 7, 6, 25, 10, 15, 14, 1, 2, 5, 10, 3, 10, 15, 8, 19, 6, 11, 2, 13, 120, 11, 76, 5, 20, 9, 68, 65, 30, 3, 34, 43, 66, 5, 10, 149, 2, 21, 20, 893, 34, 17, 20, 27, 20, 85, 58, 141, 2, 55, 20, 37, 10, 47, 110, 85, 18, 41, 40, 35, 10, 223, 26, 7, 240, 9, 8

Offset

1,3

Links

Table of n, a(n) for n=1..75.

Prog

(PARI) for(n=1, 100, s=1; while(isprime(s^2+n^2)*isprime(s+n)*isprime(s^4+n^4)==0, s++); print1(s, ", "))

Crossrefs

Sequence in context: A124151 A110179 A071559 * A248516 A097749 A126906

Adjacent sequences: A071557 A071558 A071559 * A071561 A071562 A071563

Keyword

easy,nonn

Author

Benoit Cloitre, May 30 2002

Status

approved