A065063 Numbers k such that A065608(k) is a square.

1, 2, 4, 5, 17, 20, 27, 30, 37, 101, 132, 140, 197, 257, 260, 370, 401, 430, 577, 677, 819, 832, 1025, 1036, 1070, 1166, 1297, 1601, 1950, 2060, 2270, 2486, 2583, 2673, 2691, 2716, 2917, 3137, 3145, 3730, 4357, 4396, 4635, 4958, 5477, 5540, 5612, 6094

Offset: 1

Author

Jason Earls, Nov 06 2001

Keywords

• nonn

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Programs

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