

A069022


Start of the first occurrence of two consecutive numbers divisible by an nth power.


0



1, 8, 80, 80, 1215, 16767, 76544, 636416, 3995648, 24151040, 36315135, 689278976, 1487503359, 1487503359, 155240824832, 785129144319, 4857090670592, 45922887663615, 157197025673216, 1375916505694208, 2280241934368767
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OFFSET

1,2


COMMENTS

Essentially the same as A063528. [R. J. Mathar, Sep 29 2008]


LINKS

Table of n, a(n) for n=1..21.


EXAMPLE

(8, 9) is the first occurence of two consecutive numbers divisible by a square, so a(2) = 8.


MATHEMATICA

a = {1, 1}; k = 4; Do[ While[Min[a] < n, k++; a = Drop[a, 1]; a = Append[ a, Max[ Transpose[ FactorInteger[k]] [[2]] ]]]; Print[k  1], {n, 2, 9}] (* Robert G. Wilson v *)


CROSSREFS

Cf. A069021.
Sequence in context: A034355 A289213 A201513 * A217401 A077333 A216997
Adjacent sequences: A069019 A069020 A069021 * A069023 A069024 A069025


KEYWORD

nonn


AUTHOR

Amarnath Murthy, Apr 02 2002


EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Oct 12 2003


STATUS

approved



