A028502 - OEIS

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A028502

2772-hyperperfect numbers: n = 2772*(sigma(n)-n-1) + 1.

7

95295817, 124035913, 749931337, 4275383113, 47268697363953913

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OFFSET

1,1

COMMENTS

10^20 < a(6) <= 186690534609915040044368953. - Max Alekseyev, Mar 07 2026

LINKS

Table of n, a(n) for n=1..5.

Max A. Alekseyev, Computing bounded solutions to linear Diophantine equations with the sum of divisors, arXiv:2601.17832 [math.NT], 2026. See p. 9, Table 2.

Judson S. McCranie, A Study of Hyperperfect Numbers, Journal of Integer Sequences, Vol. 3 (2000), Article 00.1.3.

CROSSREFS

Cf. A000396, A007593, A220290, A028499, A028500, A028501, A034916.

Sequence in context: A136634 A033625 A128673 * A114662 A250964 A075010

Adjacent sequences: A028499 A028500 A028501 * A028503 A028504 A028505

KEYWORD

hard,more,nonn

AUTHOR

EXTENSIONS

a(5) from Max Alekseyev, Nov 18 2019

STATUS

approved