A166089 - OEIS

A166089

a(n) = First odd number 2k+1, for which Sum_{i=1..u} J(i,2k+1) obtains value zero exactly n times when u ranges from 1 to (2k+1). Here J(i,k) is the Jacobi symbol.

1, 3, 5, 11, 13, 19, 21, 415, 29, 91, 61, 43, 105, 51, 53, 67, 249, 27, 133, 211, 45, 491, 141, 463, 101, 227, 221, 163, 237, 75, 173, 451, 99, 347, 285, 823, 197, 123, 117, 203, 397, 283, 269, 403, 297, 307, 669, 651, 317, 375, 207, 323, 357, 267, 381, 435