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A133284 Indices of the 12-gonal numbers which are also centered 12-gonal number or numbers X such that 30*X^2-24*X+3 is a square. +0
1
1, 13, 277, 6073 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n+2)=22*a(n+1)-a(n)-8 ; a(n+1)=11*a(n)-4+2*(30*a(n)^2-24*a(n)+3)^0.5

CROSSREFS

Sequence in context: A142262 A001658 A034911 this_sequence A012570 A092145 A035017

Adjacent sequences: A133281 A133282 A133283 this_sequence A133285 A133286 A133287

KEYWORD

nonn

AUTHOR

Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 16 2007

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.


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