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Search: id:A105846
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A105846 Numbers k such that 41*(k^2) + 41*k + 1 = n^2. +0
2
0, 704, 1344, 2887040, 5509760, 11831091264, 22578997184, 48483809114880, 92528724952320 (list; graph; listen)
OFFSET

1,2

FORMULA

Define a(1)=0, a(2)=704, a(3)=4098*a(1)+2048-a(2), a(4)=4098*a(2)+2048-a(1), then a(n)=4098*a(n-2)+2048-a(n-4)

CROSSREFS

Cf. A105845.

Sequence in context: A045146 A133215 A083735 this_sequence A091553 A126830 A005845

Adjacent sequences: A105843 A105844 A105845 this_sequence A105847 A105848 A105849

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), Apr 22 2005

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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