A085961 Sigma of the least numbers k for which sigma is divisible by k (where sigma is the sum of the divisors of k, A000203(k)).

1, 4, 3, 4, 15, 6, 7, 8, 18, 20, 44, 12, 13, 28, 15, 32, 68, 18, 38, 20, 42, 44, 138, 24, 150, 78, 54, 28, 174, 60, 31, 32, 132, 68, 140, 36, 74, 38, 39, 40, 164, 42, 258, 44, 90, 138, 282, 48, 98, 150, 102, 104, 212, 54, 110, 56, 57, 174, 354, 60, 183, 124, 63, 128, 195

Offset: 1

Author

Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 17 2003

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A070982, A000203, A066678.

Formula

a(n) = A000203(A070982(n)).

Extensions

More terms from John W. Layman, Aug 19 2003