A028502 2772-hyperperfect numbers: n = 2772*(sigma(n)-n-1) + 1.

95295817, 124035913, 749931337, 4275383113, 47268697363953913

Offset

1,1

Comments

10^19 < a(6) <= 186690534609915040044368953. - Max Alekseyev, Nov 30 2019

Links

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

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

Jud McCranie

Extensions

a(5) from Max Alekseyev, Nov 18 2019

Status

approved