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A167448 Smallest number with n distinct positive cubic exponents in its prime factorization. 5
1, 2, 768, 4403012567040, 384637545508886260255243527782400000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..4.

FORMULA

a(n) = Product_{k=1..n} prime(k)^((n-k+1)^3).

EXAMPLE

a(2)=768, which has a prime factorization of 2^8 * 3^1.

CROSSREFS

Subsequence of A025487.

Sequence in context: A145124 A102969 A179960 * A320481 A078169 A226779

Adjacent sequences:  A167445 A167446 A167447 * A167449 A167450 A167451

KEYWORD

nonn

AUTHOR

Matthew Vandermast, Nov 09 2009

STATUS

approved

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Last modified February 22 15:00 EST 2020. Contains 332137 sequences. (Running on oeis4.)