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1, 4, 21, 40, 1555, 3906, 299593, 3280, 87381, 435848050, 67546215517, 61035156, 61054982558011, 328114698808274, 76861433640456465, 21523360, 128583032925805678351, 953674316406, 275941052631578947368421, 1743392200
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internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..20.
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MAPLE
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A110737 := proc(n) local i, a ; if n = 1 then RETURN(1) ; else a := 2 ; while (1-a^n)/(1-a) mod n <> 0 do a := a+1 ; od ; RETURN( (1-a^n)/(1-a) ) ; fi ; end: for n from 1 to 25 do printf("%d, ", A110737(n)) : od : - R. J. Mathar, Mar 13 2007
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CROSSREFS
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Cf. A110738, A110739.
Sequence in context: A086474 A085703 A063122 * A042223 A033569 A201446
Adjacent sequences: A110734 A110735 A110736 * A110738 A110739 A110740
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 10 2005
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EXTENSIONS
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More terms from R. J. Mathar, Mar 13 2007
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STATUS
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approved
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