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A038688 Squares which are the sum of the divisors of some n. 4

%I #7 Sep 04 2013 16:00:01

%S 1,4,36,121,144,256,324,400,576,784,900,961,1024,1296,1600,1764,1936,

%T 2304,2704,2916,3136,3600,3844,4096,4356,4624,4900,5184,5776,6084,

%U 6400,7056,7744,8100,9216,9604,10000,10404,10816,11664,12544,12996,14400

%N Squares which are the sum of the divisors of some n.

%H T. D. Noe, <a href="/A038688/b038688.txt">Table of n, a(n) for n = 1..1000</a>

%t nn = 14400; t = Select[Union[DivisorSigma[1, Range[nn]]], IntegerQ[Sqrt[#]] &]; t = Select[t, # <= nn &] (* _T. D. Noe_, Sep 04 2013 *)

%Y Cf. A006532, A228061.

%K nonn

%O 1,2

%A _David W. Wilson_

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Last modified May 23 14:50 EDT 2024. Contains 372763 sequences. (Running on oeis4.)