A187678 The smallest integer for which the number of divisors is the n-th nonprime.

1, 6, 12, 24, 36, 48, 60, 192, 144, 120, 180, 240, 576, 3072, 360, 1296, 12288, 900, 960, 720, 840, 9216, 196608, 5184, 1260, 786432, 36864, 1680, 2880, 15360, 3600, 12582912, 2520, 46656, 6480, 589824, 61440, 6300, 82944, 6720, 2359296, 805306368, 5040, 3221225472, 14400, 7560

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..5789

Formula

a(n) = A005179(A018252(n)).

Crossrefs

Cf. A005179, A018252, A061286.

Sequence in context: A277336 A140522 A065218 * A124509 A319127 A367099

Adjacent sequences: A187675 A187676 A187677 * A187679 A187680 A187681

Keyword

nonn

Author

Juri-Stepan Gerasimov, Mar 12 2011

Status

approved