A093579 Take m sheets of paper, arrange them into piles, write on each sheet the cardinality (number of sheets) of its pile. Do this again, so each sheet is labeled by an ordered pair of positive integers. An integer m is in this sequence if there is a way to do this such that every sheet has a unique label, i.e., if A093578(m) > 0.

0, 1, 3, 4, 6, 7, 10, 11, 13, 14, 15, 16, 18, 19, 21, 22, 24, 25, 27, 28, 29, 31, 32, 34, 35, 36, 37, 39, 40, 42, 43, 45, 46, 47, 48, 49, 50, 51, 52, 55, 56, 58, 59, 61, 62, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 84, 85, 88, 89, 91, 92, 93, 94, 95

Offset

0,3

Links

Table of n, a(n) for n=0..70.

Example

4 is in this sequence because A093578(4) = 1 > 0; 5 is not in this sequence because A093578(5) = 0.

Crossrefs

Cf. A000217, A093578.

Sequence in context: A092494 A274429 A050618 * A347752 A060832 A341292

Adjacent sequences: A093576 A093577 A093578 * A093580 A093581 A093582

Keyword

easy,nonn

Author

Howard A. Landman, Apr 01 2004

Status

approved