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Search: id:A160970
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| A160970 |
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Indices of square numbers which are also 18-gonal numbers. |
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+0
1
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| 0, 1, 10, 44, 341, 1495, 11584, 50786, 393515, 1725229, 13367926, 58607000
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Solving the Diophantine equation A051870(m) = m*(8*m-7) = k^2 leads to the entries
k in the sequence and a list of associated m= 0, 1, 4, 16, 121, 529, 4096, 17956, 139129, 609961...
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FORMULA
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Conjecture: a(n) = 34*a(n-2)-a(n-4), n>5. [R. J. Mathar, Oct 04 2009]
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CROSSREFS
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Sequence in context: A097215 A126397 A164607 this_sequence A001488 A009540 A010926
Adjacent sequences: A160967 A160968 A160969 this_sequence A160971 A160972 A160973
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KEYWORD
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nonn
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AUTHOR
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Sture Sjoestedt (sture.sjostedt(AT)spray.se), Jun 01 2009, Jul 02 2009
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EXTENSIONS
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0 added in front and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 04 2009
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