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 A064646 Numerators of partial sums of reciprocals of primorial numbers. 1
 1, 2, 7, 74, 543, 10589, 120009, 3420257, 4767631, 2281311434, 141441308909, 51307141467, 3301022547923, 200573000466191, 433638827007904943, 328326540448842314, 31534618884970203647, 13785884222546140694347 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE n=5, Sum[1/q(j)],j=1..5 = 1/2+1/6+1/30+1/210+1/2310= (1155+385+77+11+1)/2310=1629/2310=543/770, a(5)=543 MATHEMATICA q[x_] := Apply[Times, Table[Prime[j], {j, 1, x}]] a(n)=Numerator[Apply[Plus, Table[1/q[w], {w, 1, n}]]] CROSSREFS Sequence in context: A119811 A319621 A167526 * A144905 A266880 A083455 Adjacent sequences:  A064643 A064644 A064645 * A064647 A064648 A064649 KEYWORD frac,nonn AUTHOR Labos Elemer, Oct 04 2001 STATUS approved

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Last modified October 23 07:20 EDT 2018. Contains 316520 sequences. (Running on oeis4.)