A053569 Sum of divisors of numbers which cannot be sum of divisors of any number.

3, 6, 13, 18, 12, 31, 18, 20, 32, 36, 24, 31, 42, 40, 30, 48, 54, 48, 38, 42, 44, 78, 72, 48, 57, 93, 72, 98, 54, 72, 90, 60, 62, 127, 84, 144, 68, 96, 144, 72, 74, 124, 140, 96, 80, 121, 126, 84, 108, 132, 120, 180, 90, 168, 144, 120, 98, 156, 217, 102, 104, 192, 162

Offset: 1

Author

Labos Elemer, Jan 17 2000

Keywords

• nonn

Comments

See also comments in A053474.

Examples

			The 13th non-sigma number is 26. Its divisors are {26,13,2,1} of which the sum is 42. So a(13) = 42.
Also a(20) = 42, the divisor sum of 20th term in A007369, which is 41.
		

Links

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

Crossrefs

Cf. A000203, A007369, A053474.

Formula

a(n) = A000203(A007369(n)).