

A136361


Square roots of the perfect squares in A136360; or numbers k such that k^4 is in A133459 = the sums of two nonzero pentagonal pyramidal numbers.


2




OFFSET

1,1


COMMENTS

Corresponding perfect squares in A136360 are a(n)^2 = {9, 25, 961, 17424, ...}. They correspond to the perfect fourth powers in A133459 = Sums of two nonzero pentagonal pyramidal numbers. a(n)^4 are the terms of A133459: {81, 525, 923521, 303595776, ...}. Note that the first three terms are prime.
a(9) > (5*10^20)^(1/4).  Donovan Johnson, Jun 12 2011


LINKS

Table of n, a(n) for n=1..8.


CROSSREFS

Cf. A136359, A136360, A133459, A002311, A002411, A053721.
Sequence in context: A175097 A217320 A047105 * A287474 A184302 A309725
Adjacent sequences: A136358 A136359 A136360 * A136362 A136363 A136364


KEYWORD

more,nonn


AUTHOR

Alexander Adamchuk, Dec 25 2007


EXTENSIONS

Name corrected and a(5)a(6) from Donovan Johnson, Nov 20 2010
a(7)a(8) from Donovan Johnson, Jun 12 2011


STATUS

approved



