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A120273 Absolute value of the numerator of Sum[ (-1)^i * i/Prime[i], {i,1,n}]. 0
1, 1, 13, 29, 731, 4357, 136141, 1497401, 52856987, 698076077, 49526267143, 574253997269, 72925181864501, 1123720869207397, 143426539122302791, 2236629947933814637, 422054527184135696827, 8864360144543549996813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..18.

FORMULA

a(n) = Abs[ numerator[ Sum[ (-1)^i*i/Prime[i], {i,1,n}]]].

MATHEMATICA

Abs[Numerator[Table[Sum[(-1)^i*i/Prime[i], {i, 1, n}], {n, 1, 20}]]]

CROSSREFS

Sequence in context: A166272 A195878 A013545 * A104817 A048450 A216193

Adjacent sequences:  A120270 A120271 A120272 * A120274 A120275 A120276

KEYWORD

frac,nonn

AUTHOR

Alexander Adamchuk, Jul 01 2006

STATUS

approved

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Last modified February 24 18:24 EST 2018. Contains 299628 sequences. (Running on oeis4.)