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

95295817, 124035913, 749931337, 4275383113, 47268697363953913

Offset: 1

Author

Jud McCranie

Keywords

• hard
• more
• nonn

Comments

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

Links

• 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.

Extensions

a(5) from Max Alekseyev, Nov 18 2019