A087546 a(1) = 1, a(2) = 2, a(n) = smallest multiple of n beginning with the product of two previous terms.

1, 2, 21, 420, 8820, 3704400, 32672808000, 121033149955200000, 3954492870121458201600000000, 478624728546179688151541712568320000000000000

Offset

1,2

Comments

Observation: a(n) = a(n-1)*a(n-2) for most of the terms if n is composite and >4.

Links

Table of n, a(n) for n=1..10.

Crossrefs

Cf. A087545.

Sequence in context: A245686 A091315 A359716 * A090729 A090310 A024232

Adjacent sequences: A087543 A087544 A087545 * A087547 A087548 A087549

Keyword

base,nonn

Author

Amarnath Murthy, Sep 13 2003

Extensions

More terms from David Wasserman, Jun 03 2005

Status

approved