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A061234 Smallest number with prime(n)^2 divisors where prime(n) is the n-th prime. 4
6, 36, 1296, 46656, 60466176, 2176782336, 2821109907456, 101559956668416, 131621703842267136, 6140942214464815497216, 221073919720733357899776, 10314424798490535546171949056, 13367494538843734067838845976576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n) = Min_{x : d(x) = A000005(x) = p(n)^2} = 6^(p(n)-1) because x = 2^(pp-1) > 2^(p-1)3^(p-1) holds if p > 1.

EXAMPLE

1296 = 2*2*2*2*3*3*3*3 is the smallest number with 25 divisors.

CROSSREFS

Cf. A000005, A000040, A003680, A005179, A037992, A061148, A061149, A061283, A061286.

Sequence in context: A082027 A203106 A069031 * A061584 A197191 A208655

Adjacent sequences:  A061231 A061232 A061233 * A061235 A061236 A061237

KEYWORD

nonn

AUTHOR

Labos Elemer, Jun 01 2001

STATUS

approved

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Last modified October 20 12:47 EDT 2019. Contains 328257 sequences. (Running on oeis4.)