

A051712


Numerator of b(n)b(n+1), where b(n) = n/((n+1)(n+2)) = A026741/A045896.


5



0, 1, 1, 1, 1, 5, 1, 7, 1, 3, 5, 11, 1, 13, 7, 5, 2, 17, 3, 19, 5, 7, 11, 23, 1, 25, 13, 9, 7, 29, 5, 31, 4, 11, 17, 35, 3, 37, 19, 13, 5, 41, 7, 43, 11, 15, 23, 47, 2, 49, 25, 17, 13, 53, 9, 55, 7, 19, 29, 59, 5, 61, 31, 21, 8, 65, 11, 67, 17, 23, 35, 71, 3, 73
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OFFSET

1,6


COMMENTS

b(n) = a(n+1) is multiplicative with b(2^e) = 1 if p = 2, b(3^e) = p^(e1), 3, p^e if p >= 5.


LINKS

Table of n, a(n) for n=1..74.
M. Kaneko, The AkiyamaTanigawa 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,...


CROSSREFS

Cf. A051713. Row 3 of table in A051714/A051715.
Sequence in context: A068328 A342918 A109375 * A086892 A284150 A318676
Adjacent sequences: A051709 A051710 A051711 * A051713 A051714 A051715


KEYWORD

nonn,frac,easy,mult


AUTHOR

N. J. A. Sloane


STATUS

approved



