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Search: id:A145212
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| A145212 |
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Numbers x such that there exists n in N : (x+1)^3-x^3=67*n^2 |
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+0
1
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| 146, 150922921, 155479284499938, 160173204098840720393, 165008833130429242457679826, 169990449802476728083378339741641, 175122461481848491671085102575983977058
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n+2)=1030190*a(n+1)-a(n)+515094
a(n)=-(1/2)+(293/4)*{[515095+124*sqrt(17255649)]^n+[515095-124*sqrt(17255649)]^n}-(9432688/534925119)*sqrt(17255649) *{[515095-124*sqrt(17255649)]^n-[515095+124*sqrt(17255649)]^n}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Nov 25 2008]
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EXAMPLE
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The first relation is : 147^3-146^3=67*31^2
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CROSSREFS
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Sequence in context: A043431 A166219 A097728 this_sequence A122064 A162701 A063701
Adjacent sequences: A145209 A145210 A145211 this_sequence A145213 A145214 A145215
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KEYWORD
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easy,nonn
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AUTHOR
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Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 04 2008
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