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A087546 a(1) = 1, a(2) = 2, a(n) = smallest multiple of n beginning with the product of two previous terms. 1
1, 2, 21, 420, 8820, 3704400, 32672808000, 121033149955200000, 3954492870121458201600000000, 478624728546179688151541712568320000000000000 (list; graph; refs; listen; history; text; internal format)
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: A263625 A245686 A091315 * 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

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Last modified February 24 22:57 EST 2020. Contains 332216 sequences. (Running on oeis4.)