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Search: id:A154515
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| 721, 2737, 6049, 10657, 16561, 23761, 32257, 42049, 53137, 65521, 79201, 94177, 110449, 128017, 146881, 167041, 188497, 211249, 235297, 260641, 287281, 315217, 344449, 374977, 406801, 439921, 474337, 510049, 547057, 585361, 624961, 665857
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OFFSET
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1,1
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COMMENT
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Pell's equation X^2-AY^2=1, with X=a(n); A=9n^2-n [A154516], or, A=9n^2+n [A154517]; Y=216n-12 [A154518], or, Y=216n+12 [A154519]
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FORMULA
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a(n)=648n^2+72n+1
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EXAMPLE
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For n=1, a(1)=721; n=10, a(10)=65521
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CROSSREFS
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Cf. A154510, A154516, A154517, A154518, A154519, A154511, A154514
Sequence in context: A034179 A014440 A159295 this_sequence A053497 A139154 A139165
Adjacent sequences: A154512 A154513 A154514 this_sequence A154516 A154517 A154518
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 11 2009
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