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A260850 Lexicographically earliest sequence such that for any n>1, n=u*v, where u/v = a(n)/a(n-1) in reduced form. 1
1, 2, 6, 24, 120, 20, 140, 1120, 10080, 1008, 11088, 924, 12012, 858, 1430, 22880, 388960, 1750320, 33256080, 1662804, 3879876, 176358, 4056234, 10816624, 270415600, 10400600, 280816200, 10029150, 290845350, 9694845, 300540195, 9617286240, 35263382880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(p) = p*a(p-1) for any prime p.

a(n) = A008336(n+1) for n = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 21, 22, 23; are there other indexes with this property?

LINKS

Paul Tek, Table of n, a(n) for n = 1..3365

Paul Tek, PARI program for this sequence

PROG

(PARI) See Links section.

CROSSREFS

Cf. A008336.

Sequence in context: A110808 A284567 A065422 * A008336 A033643 A050211

Adjacent sequences:  A260847 A260848 A260849 * A260851 A260852 A260853

KEYWORD

nonn

AUTHOR

Paul Tek, Aug 01 2015

STATUS

approved

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Last modified November 16 00:11 EST 2018. Contains 317252 sequences. (Running on oeis4.)