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A114993 (n-th 4-almost prime)^(n-th 4-almost prime). 0
18446744073709551616, 1333735776850284124449081472843776, 106387358923716524807713475752456393740167855629859291136, 12089258196146291747061760000000000000000000000000000000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

4-almost prime analog of A051674. A114850 is semiprime analog of A051674. a(5) = 56^56 has 94 digits.

LINKS

Table of n, a(n) for n=1..4.

FORMULA

a(n) = A014613(n)^A014613(n).

EXAMPLE

a(1) = A014613(1)^A014613(1) = 16^16 = 18446744073709551616 = 2^64.

a(2) = A014613(2)^A014613(2) = 24^24 = 1333735776850284124449081472843776 = 2^72 * 3^24.

a(3) = A014613(3)^A014613(3) = 36^36 = 2^72 * 3^72.

CROSSREFS

Cf. A001358, A014613, A051674, A113877, A114850.

Sequence in context: A115540 A104263 A221558 * A175273 A105303 A116356

Adjacent sequences:  A114990 A114991 A114992 * A114994 A114995 A114996

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, Feb 22 2006

STATUS

approved

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Last modified May 31 15:27 EDT 2020. Contains 334748 sequences. (Running on oeis4.)