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Search: id:A106176
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| A106176 |
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Numbers k such that 67*(k^2) + 67*k + 1 = n^2. |
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+0
2
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| 0, 16, 1440, 389295, 33994015, 1802660535, 2968421391, 157411709575, 13745486642391, 3714721448623416, 324376465956415720, 17201282202880383816, 28325163305411682840, 1502048325307681783960
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OFFSET
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1,2
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FORMULA
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a(1)=0, a(2)=16, a(3)=1440, a(4)=389295, a(5)=33994015, a(6)=1802660535, a(7)=9542163854*a(1)+4771081926-a(6), a(8)=9542163854*a(2)+4771081926-a(5), a(9)=9542163854*a(3)+4771081926-a(4), a(10)=9542163854*a(4)+4771081926-a(3), a(11)=9542163854*a(5)+4771081926-a(2), a(12)=9542163854*a(6)+4771081926-a(1), then a(n)=9542163854*a(n-6)+4771081926-a(n-12)
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CROSSREFS
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Cf. A106175.
Sequence in context: A134375 A057994 A160251 this_sequence A086815 A054947 A071900
Adjacent sequences: A106173 A106174 A106175 this_sequence A106177 A106178 A106179
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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 24 2005
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