A109807 Numbers n such that n^2 + 1 is a Chen prime.

1, 2, 4, 6, 10, 14, 16, 20, 24, 26, 36, 40, 56, 66, 74, 94, 116, 120, 130, 134, 146, 160, 170, 176, 204, 230, 250, 256, 260, 284, 314, 326, 340, 350, 386, 406, 430, 440, 444, 464, 466, 470, 490, 496, 536, 556, 570, 584, 634, 646, 654, 680, 686, 700, 704, 714

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[800], PrimeQ[#^2+1]&&PrimeOmega[#^2+3]<3&] (* Harvey P. Dale, May 07 2015 *)

Prog

(PARI) is(n)=isprime(n^2+1) && bigomega(n^2+3)<3 \\ Charles R Greathouse IV, Aug 19 2015

Crossrefs

Subsequence of A005574.

Cf. A005574, A109611.

Sequence in context: A066755 A089238 A005574 * A259645 A191113 A345211

Adjacent sequences: A109804 A109805 A109806 * A109808 A109809 A109810

Keyword

nonn

Author

Jason Earls, Aug 16 2005

Status

approved