A075440 - OEIS

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A075440

Numerator of 1/pp(n) - 1/pp(n+1), where pp(n) = n-th prime power.

3, 1, 1, 7, 9, 2, 5, 1, 13, 15, 17, 19, 21, 4, 3, 1, 25, 27, 5, 1, 2, 13, 33, 35, 19, 18, 39, 41, 43, 7, 17, 47, 49, 51, 53, 55, 57, 59, 61, 39, 3, 65, 67, 69, 71, 35, 38, 75, 77, 79, 81, 47, 1, 85, 87, 89, 23, 17, 71, 10, 12, 95, 97, 99, 101, 103, 5, 65, 107, 109, 4, 11, 113, 115

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..74.

EXAMPLE

a(2) = 1 because 1/pp(3) - 1/pp(2) = 1/4 - 1/8 =1/2.

CROSSREFS

Sequence in context: A220555 A369559 A373398 * A137470 A112492 A210574

Adjacent sequences: A075437 A075438 A075439 * A075441 A075442 A075443

KEYWORD

easy,nonn,frac

AUTHOR

Zak Seidov, Oct 11 2002

STATUS

approved