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

Offset

0,2

Links

Table of n, a(n) for n=0..55.

Crossrefs

a(n) = A005408(A166087(n)). Bisections: A166095, A166096. See also: A166097-A166098.

Sequence in context: A239636 A117205 A147992 * A136208 A045405 A059311

Adjacent sequences: A166086 A166087 A166088 * A166090 A166091 A166092

Keyword

nonn

Author

Antti Karttunen, Oct 08 2009

Status

approved