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A181817 a(n) is the smallest integer that, when divided by any divisor of A025487(n), yields a member of A025487. 8
1, 2, 4, 12, 8, 24, 16, 48, 360, 32, 144, 96, 720, 64, 288, 192, 1440, 128, 576, 4320, 384, 75600, 1728, 2880, 256, 1152, 8640, 768, 151200, 3456, 5760, 512, 2304, 17280, 1536, 302400, 6912, 129600, 11520, 1024, 51840, 4608, 907200, 20736, 34560, 3072, 604800, 13824, 259200, 23040, 2048 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A permutation of A181818.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

If A025487(n) = Product prime(i)^e(i), then a(n) = Product A002110(i)^e(i). I.e., a(n) = A108951(A025487(n)).

If A025487(n) = Product A002110(i)^e(i), then a(n) = Product A006939(i)^e(i).

a(n) = A025487(n) * A181816(n).

EXAMPLE

For any divisor d of 6 (d = 1, 2, 3, 6), 12/d (12, 6, 4, 2) is always a member of A025487. 12 is the smallest number with this relationship to 6; therefore, since 6 = A025487(4), a(4) = 12.

CROSSREFS

Cf. A025487, A108951, A181816, A181818.

Sequence in context: A261892 A278225 A186118 * A000348 A168342 A309515

Adjacent sequences:  A181814 A181815 A181816 * A181818 A181819 A181820

KEYWORD

nonn

AUTHOR

Matthew Vandermast, Nov 30 2010

STATUS

approved

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Last modified January 16 10:52 EST 2021. Contains 340206 sequences. (Running on oeis4.)