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Search: id:A105841
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| A105841 |
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Numbers n such that n^2 = 31*(k^2) + 31*k + 1. |
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+0
2
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| 1, 309, 50469, 8242961, 17484559, 2855704251, 466414209771, 76178131891679, 161585265485281
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(1)=1, a(2)=309, a(3)=50469, a(4)=8242961, a(5)=9241598*a(1)+a(4), a(6)=9241598*a(2)+a(3), a(7)=9241598*a(3)+a(2), a(8)=9241598*a(4)=a(1), then a(n)=9241598*a(n-4)-a(n-8)
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CROSSREFS
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Cf. A105842.
Sequence in context: A061881 A121322 A067730 this_sequence A127456 A114484 A051981
Adjacent sequences: A105838 A105839 A105840 this_sequence A105842 A105843 A105844
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KEYWORD
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nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Apr 22 2005
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