A349283 Numbers k such that A051378(k) = A051378(k+1).

14, 206, 957, 1334, 1364, 1485, 1634, 2685, 2974, 4136, 4364, 14841, 20145, 24957, 33998, 36566, 42818, 61183, 64672, 74918, 79826, 79833, 84134, 86343, 92685, 104192, 109864, 111506, 122073, 138237, 147454, 159711, 162602, 166934, 187863, 190773, 193893, 201597

Offset: 1

Author

Amiram Eldar, Nov 13 2021

Keywords

• nonn

Comments

First differs from A333949 at n = 18.

Examples

			14 is a term since A051378(14) = A051378(15) = 24.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..500

Crossrefs

Cf. A051378.

Similar sequences: A002961, A064115, A064125, A293183, A306985, A333949.

Programs

Mathematica

s[1] = 1; s[n_] := Times @@ (1 + Sum[First[#]^d, {d, Divisors[Last[#]]}] &) /@ FactorInteger[n]; Select[Range[2*10^5], s[#] == s[#+1] &]