Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jan 07 2020 09:07:05
%S 1,12,75,76,124,147,153,176,243,332,363,477,507,524,575,688,867,892,
%T 963,1075,1083,1421,1532,1573,1587,1611,1916,2032,2075,2224,2299,2401,
%U 2421,2523,2572,2883,2891,3100,3479,3776,3888,4107,4336,4527,4961,4975
%N Nonprime numbers n such that the sum of aliquot divisors of n (A001065) and product of aliquot divisors of n (A048741) are both perfect squares.
%H Amiram Eldar, <a href="/A064121/b064121.txt">Table of n, a(n) for n = 1..10000</a>
%t Select[ Range[5000], IntegerQ[ Sqrt[ Apply[ Plus, Delete[ Divisors[ # ], -1]]]] && IntegerQ[ Sqrt[ Apply[ Times, Delete[Divisors[ # ], -1]]]] && ! PrimeQ[ # ] & ]
%Y Variant of A064116. - _R. J. Mathar_, Oct 02 2008
%Y Cf. A064710.
%K easy,nonn
%O 1,2
%A _Robert G. Wilson v_, Oct 14 2001