A161578 a(1)=2. a(n) = the smallest integer > a(n-1) such that d(a(n)) <= d(n), where d(n) = the number of divisors of n.

2, 3, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 37, 38, 39, 41, 43, 44, 47, 49, 51, 53, 59, 61, 67, 69, 71, 73, 79, 81, 83, 85, 86, 87, 89, 91, 97, 101, 103, 104, 107, 109, 113, 115, 116, 118, 127, 128, 131, 133, 134, 137, 139, 141, 142, 143, 145

Offset

1,1

Comments

Starting the sequence with a(1)=1 instead would have lead to a(n) = n for all n, obviously.

Links

Table of n, a(n) for n=1..57.

Crossrefs

Cf. A137518, A161576, A161577.

Sequence in context: A352584 A038179 A192489 * A261271 A335284 A308966

Adjacent sequences: A161575 A161576 A161577 * A161579 A161580 A161581

Keyword

nonn

Author

Leroy Quet, Jun 14 2009

Extensions

More terms from Sean A. Irvine, Feb 23 2011

Status

approved