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A136339 a(1) = 1; for all n >= 2, we choose a(n) to be as small as possible so that for all i = 1, ..., n, the sequence of the i-th divisors of a(1), a(2), ..., a(n) is nonincreasing. 0
1, 2, 4, 6, 12, 24, 48, 60, 120, 240, 360, 720, 1260, 1680, 2520, 5040, 10080, 15120, 25200, 27720, 55440, 110880, 166320, 277200, 554400, 720720, 1441440, 2162160, 3603600, 7207200, 10810800, 21621600, 43243200, 73513440, 122522400 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The original definition of this sequence was: a(n+1) = smallest number such that the d-th divisors of a(n), a(n+1) will never increase. [What is d?]
Similar to A094783, except that only members of the sequence can disqualify larger numbers.
LINKS
EXAMPLE
What is a(13), the term after 720? It cannot be 840 because 720's 13th smallest divisor is 18 and 840's 13th smallest divisor is 20 > 18.
CROSSREFS
Cf. A094783.
Sequence in context: A068010 A095848 A208767 * A019505 A350049 A135614
KEYWORD
nonn
AUTHOR
J. Lowell, Mar 28 2008
EXTENSIONS
Edited by N. J. A. Sloane, Apr 04 2008. I tried to rewrite the definition to make it precise, but I am not sure I have done this correctly.
More terms from Hagen von Eitzen, Oct 03 2009
STATUS
approved

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)