Number of primes congruent to 1 modulo 4 dividing n (with multiplicity).
0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 2, 1, 0, 0, 1, 1, 0, 0, 0, 1
1 seqfan posts
Wed Dec 23 19:51:50 CET 2009 [seqfan] A170817, A170818 xref suggested