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A112072 Odd numbers n for which 3 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1. 2
7, 9, 15, 17, 31, 33, 39, 41, 55, 57, 63, 65, 79, 81, 87, 89, 103, 105, 111, 113, 127, 129, 135, 137, 151, 153, 159, 161, 175, 177, 183, 185, 199, 201, 207, 209, 223, 225, 231, 233, 247, 249, 255, 257, 271, 273, 279, 281, 295, 297, 303, 305, 319, 321, 327 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

FORMULA

a(n)=-7+Sum_{k=0..n}{-2*(k mod 4)+2*((k+1) mod 4)+4*((k+3) mod 4)} - Paolo P. Lava, Aug 29 2007

CROSSREFS

Row 2 of A112070. a(n) = 2*A112062(n)+1.

Sequence in context: A067873 A217460 A047522 * A024902 A111312 A158891

Adjacent sequences:  A112069 A112070 A112071 * A112073 A112074 A112075

KEYWORD

nonn

AUTHOR

Antti Karttunen, Aug 27 2005

STATUS

approved

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Last modified June 13 10:10 EDT 2021. Contains 344981 sequences. (Running on oeis4.)