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A097579 Triangular numbers k such that 2*k-1 is also a triangular number. 0
1, 28, 946, 32131, 1091503, 37078966, 1259593336, 42789094453, 1453569618061, 49378577919616, 1677418079648878, 56982836130142231, 1935739010345186971, 65758143515606214778, 2233841140520266115476, 75884840634173441711401 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
G.f.: x*(1-7*x+x^2)/((1-x)*(1-34*x+x^2)).
MATHEMATICA
CoefficientList[ Series[x*(1 - 7*x + x^2)/((1 - x)*(1 - 34*x + x^2)), {x, 0, 16}], x] (* Robert G. Wilson v, Sep 01 2004 *)
CROSSREFS
Sequence in context: A129461 A239336 A203135 * A091549 A034904 A189995
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Aug 29 2004
EXTENSIONS
More terms from Robert G. Wilson v, Sep 01 2004
STATUS
approved

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)