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A034898
n-th term of A034897 is an a(n)-hyperperfect number.
3
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
1,2
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, Sect. B2.
Roberts, Lure of the Integers, see Integer 28, p. 177.
LINKS
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.
PROG
(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
CROSSREFS
Cf. A034897.
Sequence in context: A060556 A222969 A132813 * A059300 A321331 A046803
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Donovan Johnson, Nov 20 2012
STATUS
approved