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A352571
Index of n in A338833, or -1 if n does not appear there.
3
1, -1, 2, -1, 13, 3, 17, -1, 5, 8, 25, 4, 9, 14, 45, -1, 6, 7, 21, 10, 24, 28, 50, 15, 20, 40, 34, 31, 41, 35, 80, -1, 12, 22, 68, 23, 42, 55, 63, 26, 30, 56, 64, 51, 75, 86, 125, 11, 16, 72, 95, 27, 46, 59, 99, 60, 69, 91, 124, 87, 139, 168, 249, -1, 33, 18, 29, 32, 58, 71, 103, 19, 57, 44, 112, 70, 108, 90, 117, 47, 53, 94, 145, 66, 83, 76, 149, 65
OFFSET
1,3
COMMENTS
a(n) = -1 iff n = 2^k, k>0.
LINKS
Rémy Sigrist, PARI program
PROG
(PARI) See Links section.
CROSSREFS
Sequence in context: A007418 A037271 A074955 * A245625 A292947 A143663
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Apr 04 2022
STATUS
approved