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A175720 a(1) = 1, for n >= 2, a(n) = the smallest number m with (a(n-1) + 4) divisors. 2
1, 16, 240, 17293822569102704640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..4.

FORMULA

A000005(a(n)) = a(n-1) + 4 for n >= 2.

EXAMPLE

a(3) = 240 = the smallest number with 16 + 4 = 20 divisors.

CROSSREFS

Cf. A014221, A175718, A175719.

Sequence in context: A005619 A204793 A173605 * A135518 A179092 A231020

Adjacent sequences:  A175717 A175718 A175719 * A175721 A175722 A175723

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Aug 15 2010

STATUS

approved

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Last modified October 19 13:38 EDT 2018. Contains 316361 sequences. (Running on oeis4.)