A275468 Least k such that d(k*n^2) = d(n*k^2) where d = A000005.

1, 2, 2, 4, 2, 6, 2, 8, 4, 6, 2, 12, 2, 6, 6, 16, 2, 12, 2, 12, 6, 6, 2, 24, 4, 6, 8, 12, 2, 30, 2, 6, 6, 6, 6, 36, 2, 6, 6, 24, 2, 30, 2, 12, 18, 6, 2, 45, 4, 18, 6, 12, 2, 24, 6, 24, 6, 6, 2, 60, 2, 6, 18, 64, 6, 30, 2, 12, 6, 30, 2, 72, 2, 6, 12, 12, 6, 30, 2, 48, 16, 6, 2, 60, 6, 6, 6, 24

Offset

1,2

Comments

Numbers n such that a(n) is different from A046523(n) are 32, 45, 48, 50, 63, ...

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Example

a(32) = 6 because A000005(6*32^2) = A000005(32*6^2).

Prog

(PARI) a(n) = {my(k = 1); while (numdiv(k*n^2) != numdiv(n*k^2), k++); k; }

Crossrefs

Cf. A000005, A046523.

Sequence in context: A364949 A083260 A284011 * A046523 A278524 A278523

Adjacent sequences: A275465 A275466 A275467 * A275469 A275470 A275471

Keyword

nonn

Author

Altug Alkan, Jul 28 2016

Status

approved