A215249 a(n) is the smallest number m >= n such that m^2 + n is a prime.

1, 3, 4, 5, 6, 11, 8, 9, 10, 11, 24, 13, 16, 15, 16, 21, 24, 19, 20, 21, 40, 25, 24, 35, 26, 69, 28, 33, 30, 31, 34, 39, 56, 35, 48, 49, 38, 39, 50, 41, 54, 47, 44, 45, 46, 49, 48, 53, 50, 57, 56, 53, 54, 55, 56, 69, 64, 59, 60, 67, 64, 105, 64, 65, 66, 71, 68, 75

Offset

1,2

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Mathematica

Table[m = n; While[! PrimeQ[m^2 + n], m++]; m, {n, 100}] (* T. D. Noe, Aug 12 2012 *)

Crossrefs

Cf. A058055, A085099.

Sequence in context: A143713 A271821 A261459 * A089912 A047425 A048989

Adjacent sequences: A215246 A215247 A215248 * A215250 A215251 A215252

Keyword

nonn

Author

N. J. A. Sloane, Aug 10 2012

Status

approved