A091861 a(1) = 1; a(n) = smallest positive unpicked integer such that n-k divides evenly into a(n)*a(k) for every k, 1 <= k <= n-1.

1, 2, 4, 3, 12, 30, 60, 420, 840, 1260, 630, 27720, 4620, 60060, 30030, 120120, 240240, 2042040, 3063060, 232792560, 58198140, 38798760, 19399380, 446185740, 892371480, 2230928700, 4461857400, 40156716600, 20078358300, 582272390700

Offset

1,2

Links

Table of n, a(n) for n=1..30.

Crossrefs

Sequence in context: A209048 A181327 A257503 * A200715 A297901 A079308

Adjacent sequences: A091858 A091859 A091860 * A091862 A091863 A091864

Keyword

nonn

Author

Leroy Quet, Mar 13 2004

Extensions

More terms from John W. Layman, May 18 2004

Further terms from Jon E. Schoenfield, Jun 21 2007

Status

approved