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A088726 Smallest numbers having exactly n divisors d>1 such that also d+1 is a divisor. 9
1, 6, 12, 72, 60, 180, 360, 420, 840, 1260, 3780, 2520, 5040, 13860, 36960, 41580, 27720, 55440, 83160, 166320, 277200, 491400, 471240, 360360, 1113840, 720720, 1081080, 3341520, 2162160, 2827440, 5405400, 4324320, 12972960, 6126120 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A088722(a(n))=n, A088722(k)<>n, for n<a(n).

LINKS

Ray Chandler, Table of n, a(n) for n=0..57

FORMULA

a(n) = 2*A130317(n+1) for n>0. - Chandler

CROSSREFS

Cf. A088722, A088723, A088724, A088725.

Sequence in context: A121735 A070970 A045780 * A163342 A107904 A071930

Adjacent sequences:  A088723 A088724 A088725 * A088727 A088728 A088729

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 12 2003

EXTENSIONS

Extended by Ray Chandler, May 29 2008

STATUS

approved

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Last modified July 22 17:31 EDT 2018. Contains 312914 sequences. (Running on oeis4.)