A073108 Least k such that there are n primes among the numbers n^2 + x^2 for 1 <= x <= k.

1, 3, 10, 11, 16, 29, 38, 35, 64, 29, 54, 107, 58, 69, 92, 85, 82, 163, 124, 81, 190, 155, 142, 241, 116, 139, 338, 213, 176, 221, 214, 223, 520, 211, 184, 361, 278, 267, 400, 179, 294, 607, 288, 335, 362, 379, 342, 587, 394, 261

Offset

1,2

Links

Table of n, a(n) for n=1..50.

Prog

(PARI) a(n)=if(n<0, 0, s=1; while(sum(k=1, s, isprime(k^2+n^2))<n, s++); s)

Crossrefs

Sequence in context: A357708 A169939 A357627 * A352776 A255160 A344892

Adjacent sequences: A073105 A073106 A073107 * A073109 A073110 A073111

Keyword

easy,nonn

Author

Benoit Cloitre, Aug 19 2002

Status

approved