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

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;
a(5) = 5^2^2 = 625.

Crossrefs

Cf. A000040, A000961, A217261.

Sequence in context: A217261 A372405 A277562 * A257854 A017672 A055013

Adjacent sequences: A217706 A217707 A217708 * A217710 A217711 A217712

Keyword

nonn,easy

Author

Jonathan Vos Post, Mar 20 2013

Extensions

More terms from Alois P. Heinz, Mar 20 2013

Status

approved