OFFSET
1,1
COMMENTS
Subsequence of A007634. Numbers in A007634 but not in here are 420, 431, 491, 492, 514, 533, 573, etc. (A097822). - R. J. Mathar, Aug 17 2013
LINKS
Shyam Sunder Gupta, Table of n, a(n) for n = 1..4760
EXAMPLE
a(3) = 44 is in the sequence because 44^2 + 44 + 41 = 43*47 is semiprime.
MATHEMATICA
a = {}; Do[
If[PrimeOmega[x^2 + x + 41] == 2, AppendTo[a, x]], {x, 1, 500}]; a
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Shyam Sunder Gupta, Aug 15 2013
STATUS
approved