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Search: id:A166725
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A166725 (2n+1)25^n +0
1
1, 75, 3125, 109375, 3515625, 107421875, 3173828125, 91552734375, 2593994140625, 72479248046875, 2002716064453125, 54836273193359375, 1490116119384765625, 40233135223388671875, 1080334186553955078125 (list; graph; listen)
OFFSET

0,2

COMMENT

Sum_{k>=0} 1/a(k) = (5/2)log(3/2)

FORMULA

G.f.: (1+25*x)/(1-25*x)^2

PROGRAM

(PARI) a(n)=(2*n+1)*25^n

CROSSREFS

Cf. (2n+1)4^n A058962, (2n+1)9^n A155988, log(3/2) A016578.

Sequence in context: A133382 A017791 A017738 this_sequence A075913 A134228 A110902

Adjacent sequences: A166722 A166723 A166724 this_sequence A166726 A166727 A166728

KEYWORD

nonn

AUTHOR

Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009

page 1

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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