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Search: id:A154378
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| 240, 490, 740, 990, 1240, 1490, 1740, 1990, 2240, 2490, 2740, 2990, 3240, 3490, 3740, 3990, 4240, 4490, 4740, 4990, 5240, 5490, 5740, 5990, 6240, 6490, 6740, 6990, 7240, 7490, 7740, 7990, 8240, 8490, 8740, 8990, 9240, 9490, 9740, 9990, 10240, 10490
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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 Y=a(n); X=1250n^2-100n+1 [A154374], or X=1250n^2+100n+1 [A154375]; A=25n^22n [A154376], or, A=25n^2+2n [A154377]
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FORMULA
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a(n)=250n-10
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EXAMPLE
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For n=1, a(1)=240; n=3, a(3)=740
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CROSSREFS
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Cf. A154379, A154374, A154375, A154376, A154377
Sequence in context: A067373 A030638 A099833 this_sequence A063372 A070123 A119659
Adjacent sequences: A154375 A154376 A154377 this_sequence A154379 A154380 A154381
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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 08 2009
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