OFFSET
1,1
COMMENTS
It appears that the first differences of this sequence are never of the form 4k+2.
PROG
(PARI) lista(nn) = select(n->(isprime(1+sum(k=1, n, 3*k))), vector(nn, i, i)); \\ Michel Marcus, Jul 10 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
John W. Layman, Oct 26 2007
STATUS
approved