A217709 - OEIS

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A217709

Numbers of the form p^q^r, for p,q,r primes.

16, 81, 256, 512, 625, 2401, 6561, 14641, 19683, 28561, 83521, 130321, 279841, 390625, 707281, 923521, 1874161, 1953125, 2825761, 3418801, 4879681, 5764801, 7890481, 12117361, 13845841, 20151121, 25411681, 28398241, 33554432, 38950081, 40353607, 47458321

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OFFSET

1,1

COMMENTS

Subset of A217261. Sequence suggested by Kevin L. Schwartz in a Facebook discussion.

LINKS

Table of n, a(n) for n=1..32.

EXAMPLE

a(1) = 2^2^2 = 16;

a(2) = 3^2^2 = 81;

a(3) = 2^2^3 = 256;

a(4) = 2^3^2 = 512;