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 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. 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS 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

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Last modified July 21 06:50 EDT 2019. Contains 325191 sequences. (Running on oeis4.)