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A038536 Odd values of n > 1 for which there are n-hyperperfect numbers. 4


%S 3,11,19,31,35,59,75,91,111,115,131,151,179,235,255,311,335,339,371,

%T 375,399,411,431,439,495,515,531,539,551,591,619,675,739,791,795,811,

%U 839,851,871,915,951,999,1015,1035,1039,1055,1071,1075,1155,1231,1351

%N Odd values of n > 1 for which there are n-hyperperfect numbers.

%D D. Minoli, Issues in non-linear hyperperfect numbers, Math. Comp., 34 (1980), 639-645.

%D J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 177.

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

%H J. S. McCranie, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3</a>

%Y Cf. A007592.

%K nonn

%O 1,1

%A _Jud McCranie_

%E [ (3*a(i)+1)/2 ]^2*(3*a(i)+4) is a(i)-hyperperfect

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Last modified November 26 12:35 EST 2015. Contains 264502 sequences.