A051713 Denominator of b(n)-b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896.

1, 60, 60, 70, 84, 504, 120, 990, 165, 572, 1092, 2730, 280, 4080, 2448, 1938, 855, 7980, 1540, 10626, 3036, 4600, 7800, 17550, 819, 21924, 12180, 8990, 7440, 32736, 5984, 39270, 5355, 15540, 25308, 54834, 4940, 63960, 34440

Offset

1,2

Links

Table of n, a(n) for n=1..39.

M. Kaneko, The Akiyama-Tanigawa algorithm for Bernoulli numbers, J. Integer Sequences, 3 (2000), #00.2.9.

Example

0, 1/60, 1/60, 1/70, 1/84, 5/504, 1/120, 7/990, 1/165, 3/572,...

Mathematica

Denominator[#[[1]]-#[[2]]&/@(Partition[#[[1]]/(#[[2]]#[[3]])&/@Partition[ Range[50], 3, 1], 2, 1])] (* Harvey P. Dale, Nov 15 2014 *)

Crossrefs

Cf. A051712. Row 3 of table in A051714/A051715.

Sequence in context: A060512 A060513 A283531 * A060225 A124901 A298688

Adjacent sequences: A051710 A051711 A051712 * A051714 A051715 A051716

Keyword

nonn,frac,easy

Author

N. J. A. Sloane

Status

approved