A175141 a(1)=2. a(n) = the smallest integer > a(n-1) that is not equal to the sum of the divisors of any earlier term.

2, 4, 5, 8, 9, 10, 11, 14, 16, 17, 19, 21, 22, 23, 25, 26, 27, 28, 29, 33, 34, 35, 37, 39, 41, 43, 45, 46, 47, 49, 50, 51, 52, 53, 55, 58, 59, 61, 63, 64, 65, 66, 67, 69, 70, 71, 73, 75, 76, 77, 79, 81, 82, 83, 85, 86, 87, 88, 89, 91, 92, 94, 95, 97, 99, 100, 101, 103, 105, 106

Offset

1,1

Comments

If a positive integer n occurs in the sequence, then sigma(n) does not, where sigma(m) = A000203(m).

sigma(a(m)) = A175142(m).

Links

Table of n, a(n) for n=1..70.

Crossrefs

Cf. A175142, A000203.

Sequence in context: A035262 A010440 A072008 * A072756 A325429 A004761

Adjacent sequences: A175138 A175139 A175140 * A175142 A175143 A175144

Keyword

nonn

Author

Leroy Quet, Feb 23 2010

Extensions

Extended by Ray Chandler, Mar 06 2010

Status

approved