A034898 n-th term of A034897 is an a(n)-hyperperfect number.

1, 2, 1, 6, 3, 1, 12, 18, 18, 12, 2, 30, 1, 11, 6, 2, 60, 48, 19, 132, 132, 10, 192, 2, 31, 168, 108, 66, 35, 252, 78, 132, 342, 366, 390, 168, 348, 282, 498, 540, 546, 59, 12, 378, 438, 4, 222, 336, 18, 660, 138, 798, 810, 528, 450, 75, 252, 150, 948, 162

Offset: 1

Author

Jud McCranie

Keywords

• nonn

References

• R. K. Guy, Unsolved Problems in Number Theory, Sect. B2.
• Roberts, Lure of the Integers, see Integer 28, p. 177.

Links

• Donovan Johnson, Table of n, a(n) for n = 1..10000
• Judson S. McCranie, A Study of Hyperperfect Numbers, Journal of Integer Sequences, Vol. 3 (2000), Article 00.1.3.
• Eric Weisstein's World of Mathematics, Hyperperfect Number.

Crossrefs

Cf. A034897.

Programs

PARI

forcomposite(n=2, 10^8, if(1==Mod(n, sigma(n)-n-1), print1((n-1)/(sigma(n)-n-1)", "))) \\ Hans Loeblich, May 10 2019

Extensions

More terms from Donovan Johnson, Nov 20 2012