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A136361
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Square roots of the perfect squares in A136360; or numbers k such k^4 are in A133459 = the sums of two nonzero pentagonal pyramidal numbers.
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2
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OFFSET
| 1,1
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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
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CROSSREFS
| Cf. A136359, A136360, A133459, A002311, A002411, A053721.
Sequence in context: A106893 A175097 A047105 * A184302 A109173 A179387
Adjacent sequences: A136358 A136359 A136360 * A136362 A136363 A136364
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KEYWORD
| more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Dec 25 2007
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EXTENSIONS
| Changed A133360 to A136360 and a(5)-a(6) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 20 2010
a(7)-a(8) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jun 12 2011
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