A065063 - OEIS

%I #12 Jun 18 2018 03:34:22

%S 1,2,4,5,17,20,27,30,37,101,132,140,197,257,260,370,401,430,577,677,

%T 819,832,1025,1036,1070,1166,1297,1601,1950,2060,2270,2486,2583,2673,

%U 2691,2716,2917,3137,3145,3730,4357,4396,4635,4958,5477,5540,5612,6094

%N Numbers k such that A065608(k) is a square.

%H Harry J. Smith, <a href="/A065063/b065063.txt">Table of n, a(n) for n = 1..1000</a>

%o (PARI) { n=0; for (m=1, 10^9, if (issquare(sigma(m) - numdiv(m)), write("b065063.txt", n++, " ", m); if (n==1000, return)) ) } \\ _Harry J. Smith_, Oct 05 2009

%K nonn

%O 1,2

%A _Jason Earls_, Nov 06 2001