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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
3, 5, 31, 132, 1068, 9672, 50664, 145060 (list; graph; refs; listen; history; text; internal format)



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


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


Cf. A136359, A136360, A133459, A002311, A002411, A053721.

Sequence in context: A175097 A217320 A047105 * A287474 A184302 A309725

Adjacent sequences:  A136358 A136359 A136360 * A136362 A136363 A136364




Alexander Adamchuk, Dec 25 2007


Name corrected and a(5)-a(6) from Donovan Johnson, Nov 20 2010

a(7)-a(8) from Donovan Johnson, Jun 12 2011



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Last modified December 14 05:36 EST 2019. Contains 329978 sequences. (Running on oeis4.)