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A038536 Odd values of n > 1 for which there are n-hyperperfect numbers. 4
3, 11, 19, 31, 35, 59, 75, 91, 111, 115, 131, 151, 179, 235, 255, 311, 335, 339, 371, 375, 399, 411, 431, 439, 495, 515, 531, 539, 551, 591, 619, 675, 739, 791, 795, 811, 839, 851, 871, 915, 951, 999, 1015, 1035, 1039, 1055, 1071, 1075, 1155, 1231, 1351 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
((3*a(i)+1)/2)^2*(3*a(i)+4) is a(i)-hyperperfect.
REFERENCES
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 177.
R. K. Guy, Unsolved Problems in Number Theory, B2.
LINKS
J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3.
Daniel Minoli, Issues In Non-Linear Hyperperfect Numbers, Mathematics of Computation, Vol. 34, No. 150, April 1980, pp. 639-645.
CROSSREFS
Cf. A007592.
Sequence in context: A289840 A125994 A137295 * A175122 A031369 A014223
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)