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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

%I

%S 1,2,6,24,120,20,140,1120,10080,1008,11088,924,12012,858,1430,22880,

%T 388960,1750320,33256080,1662804,3879876,176358,4056234,10816624,

%U 270415600,10400600,280816200,10029150,290845350,9694845,300540195,9617286240,35263382880

%N Lexicographically earliest sequence such that for any n>1, n=u*v, where u/v = a(n)/a(n-1) in reduced form.

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

%C 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?

%H Paul Tek, <a href="/A260850/b260850.txt">Table of n, a(n) for n = 1..3365</a>

%H Paul Tek, <a href="/A260850/a260850.txt">PARI program for this sequence</a>

%o (PARI) See Links section.

%Y Cf. A008336.

%K nonn

%O 1,2

%A _Paul Tek_, Aug 01 2015

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Last modified March 26 02:36 EDT 2023. Contains 361529 sequences. (Running on oeis4.)