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A316665 a(n) is the least k > 0 such that k*n does not belong to A002202. 1
3, 7, 1, 17, 1, 15, 1, 19, 1, 5, 1, 43, 1, 1, 1, 19, 1, 5, 1, 17, 1, 7, 1, 167, 1, 1, 1, 11, 1, 3, 1, 19, 1, 1, 1, 67, 1, 1, 1, 17, 1, 17, 1, 7, 1, 5, 1, 211, 1, 1, 1, 7, 1, 11, 1, 13, 1, 3, 1, 139, 1, 1, 1, 31, 1, 9, 1, 1, 1, 5, 1, 109, 1, 1, 1, 1, 1, 3, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are odd.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, Scatterplot of (x, y) such that 1 <= x, y <= 500 and x*y does not belong to A002202

FORMULA

a(n) = 1 iff n belongs to A007617.

PROG

(PARI) a(n) = forstep (k=1, oo, 2, if (!istotient(n*k), return (k)))

CROSSREFS

Cf. A002202, A007617.

Sequence in context: A210037 A210197 A324715 * A110238 A077505 A247382

Adjacent sequences:  A316662 A316663 A316664 * A316666 A316667 A316668

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Jul 10 2018

STATUS

approved

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Last modified July 20 14:01 EDT 2019. Contains 325181 sequences. (Running on oeis4.)