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 A120352 Numerator of Sum[ 1/k^p, {k,1,p-1} ]], where p = Prime[n]. 1
 1, 9, 257875, 940908897061, 26038773205374138944970092886340352227, 5706439637514064062030256049808675747470805004854626598761, 3819751175863358416058062379293843331497647520922258560223903226691067255782388923965399403291707829 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS p^3 divides a(n) for n>2. A119722[n] = a(n)/p^3, p=Prime[n]. Numerators of Sum[ 1/k^n, {k,1,n-1} ] are listed in A120347(n) = {1, 9, 1393, 257875, 47463376609, 940908897061, ...}. LINKS FORMULA a(n) = Numerator[ Sum[ 1/k^Prime[n], {k,1,Prime[n]-1} ]]. a(n) = Numerator[ Zeta[p] - Zeta[p,p] ], for p = Prime[n]. a(n) = A120347[ Prime[n] ]. MATHEMATICA Table[Numerator[Sum[1/k^Prime[n], {k, 1, Prime[n]-1}]], {n, 1, 8}] CROSSREFS Cf. A119722. Cf. A120347. Sequence in context: A109464 A300195 A159344 * A225069 A058468 A133414 Adjacent sequences:  A120349 A120350 A120351 * A120353 A120354 A120355 KEYWORD frac,nonn AUTHOR Alexander Adamchuk, Aug 16 2006, Oct 31 2006 STATUS approved

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Last modified August 25 10:10 EDT 2019. Contains 326324 sequences. (Running on oeis4.)