A380391 Numbers k such that A343750(k) != k.

10, 12, 14, 16, 18, 20, 28, 30, 31, 32, 34, 35, 36, 38, 40, 42, 50, 51, 52, 54, 56, 60, 62, 64, 68, 70, 71, 72, 73, 74, 75, 76, 78, 80, 84, 85, 90, 91, 92, 93, 94, 95, 96, 97, 98, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 112, 114, 115, 116, 118, 119, 120

Offset

1,1

Links

Table of n, a(n) for n=1..63.

Example

k = 13: A343750(13) = 13, thus k = 13 is not in the sequence.
k = 14: A343750(14) = 41, thus k = 14 is a term.

Mathematica

q[k_] := Module[{perm = FromDigits /@ Permutations[IntegerDigits[k]], d}, d = DivisorSigma[0, perm]; Min@ perm[[Position[d, Min[d]] // Flatten]] != k]; Select[Range[120], q] (* Amiram Eldar, Jan 24 2025 *)

Crossrefs

Cf. A000005, A004719, A010785, A272215, A343750.

Sequence in context: A298298 A247393 A055983 * A318700 A180157 A309539

Adjacent sequences: A380388 A380389 A380390 * A380392 A380393 A380394

Keyword

nonn,base

Author

Ctibor O. Zizka, Jan 23 2025

Status

approved