A336558 Numbers k such that A336456(n) is not equal to Product_{p^e|n} A336456(p^e). Here each p^e is the maximal power of prime p that divides k, and A336456(n) = A335915(sigma(sigma(n))).

10, 21, 22, 30, 33, 34, 35, 40, 42, 46, 52, 55, 57, 58, 65, 66, 69, 70, 77, 82, 84, 85, 88, 90, 91, 93, 94, 98, 102, 105, 106, 110, 114, 115, 118, 119, 120, 129, 130, 132, 133, 135, 136, 138, 140, 141, 142, 145, 152, 154, 155, 156, 160, 161, 164, 165, 166, 168, 170, 174, 177, 178, 182, 184, 185, 186, 187, 189, 190

Offset

1,1

Comments

Numbers at which points A336456 is not multiplicative.

Note that in contrast to A051027 (case in A336548), here Product_{p^e|n} A336456(p^e) can be also less than A336456(n), not just greater than or equal.

Links

Antti Karttunen, Table of n, a(n) for n = 1..25000

Crossrefs

Cf. A335915, A336546, A336557 (complement), A336559.

Subsequence of A336548.

Sequence in context: A244539 A335236 A164712 * A338908 A226195 A181450

Adjacent sequences: A336555 A336556 A336557 * A336559 A336560 A336561

Keyword

nonn

Author

Antti Karttunen, Jul 25 2020

Status

approved