A340582 Numbers k such that sigma(k) = 4 * sigma(k+1).

25908120, 136616760, 171430560, 196876680, 354049920, 405601560, 514374840, 825473880, 1204476000, 2223650520, 2510539920, 3003191100, 4017339480, 4574146500, 6129062940, 6797728800, 7311296520, 9779952000, 12472435080, 13103164800, 19989450000, 22180840920, 22710872520

Offset: 1

Author

Seiichi Manyama, Jan 21 2021

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..30 (using A058073 data)

Crossrefs

Cf. A002961, A080372, A163193, A217791, A340713, A340720.

Extensions

a(9)-a(23) from Seiichi Manyama using A058073 data, Jan 21 2021