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A034898 n-th term of A034897 is an a(n)-hyperperfect number. 3

%I #26 May 10 2019 16:10:27

%S 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,

%T 168,108,66,35,252,78,132,342,366,390,168,348,282,498,540,546,59,12,

%U 378,438,4,222,336,18,660,138,798,810,528,450,75,252,150,948,162

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

%D R. K. Guy, Unsolved Problems in Number Theory, Sect. B2.

%D Roberts, Lure of the Integers, see Integer 28, p. 177.

%H Donovan Johnson, <a href="/A034898/b034898.txt">Table of n, a(n) for n = 1..10000</a>

%H Judson S. McCranie, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL3/mccranie.html">A Study of Hyperperfect Numbers</a>, Journal of Integer Sequences, Vol. 3 (2000), Article 00.1.3.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HyperperfectNumber.html">Hyperperfect Number.</a>

%o (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

%Y Cf. A034897.

%K nonn

%O 1,2

%A _Jud McCranie_

%E More terms from _Donovan Johnson_, Nov 20 2012

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)