A371953 - OEIS

A371953

Weird numbers whose abundance is a weird number with weird abundance (A371952).

13516958630, 13662237610, 14483820470, 16161187910, 16266406870, 17187072770, 17779204310, 18055129190, 19265719130, 20027984690, 20291032090, 20945054548, 21036318170, 21395831170, 21983936030, 22134086030, 22335605390, 23837897510, 24709171970, 25630894310, 26286582910

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OFFSET

1,1

COMMENTS

Terms k of A006037 such that A033880(k) and A033880(A033880(k)) are also terms of A006037.

Are there numbers k such that k, A033880(k), A033880(A033880(k)), and A033880(A033880(A033880(k))) are all terms of A006037? There are none below 10^11.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..146 (terms below 10^11)

Wikipedia, Weird number.

EXAMPLE

13516958630 is a term because it is a weird number, A033880(13516958630) = sigma(13516958630) - 2*13516958630 = 833308916 is a weird number, and A033880(833308916) = sigma(833308916) - 2*833308916 = 7975928 is also a weird number.

CROSSREFS

Subsequence of A006037, A371920 and A371952.

Cf. A000203 (sigma), A033880 (abundance).

Sequence in context: A113639 A059122 A102567 * A016932 A016992 A017160

Adjacent sequences: A371950 A371951 A371952 * A371954 A371955 A371956

KEYWORD

nonn

AUTHOR

Amiram Eldar, Apr 14 2024

STATUS

approved