A130503 a(n) = denominator of the sum of reciprocals of those positive integers which are <= n and are not among the first (n-1) terms of A130502.

1, 2, 6, 12, 12, 4, 28, 56, 504, 2520, 27720, 27720, 27720, 27720, 5544, 11088, 188496, 62832, 1193808, 5969040, 1989680, 1989680, 45762640, 137287920, 686439600, 8923714800, 80313433200, 80313433200, 2329089562800, 2329089562800

Offset

1,2

Links

Diana Mecum, Table of n, a(n) for n = 1..200

Example

The positive integers which are <= 9 and are missing from the first 8 terms of the (numerator) sequence A130502 are 2,3,4,6,7,8,9. So a(9) is the denominator of (1/2 +1/3 +1/4 +1/6 +1/7 +1/8 + 1/9 = 821/504).

Crossrefs

Cf. A130502.

Sequence in context: A127698 A379620 A379518 * A278232 A074385 A057340

Adjacent sequences: A130500 A130501 A130502 * A130504 A130505 A130506

Keyword

frac,nonn

Author

Leroy Quet, May 31 2007

Extensions

More terms from Diana L. Mecum, Jun 14 2007

Status

approved