OFFSET
1,1
COMMENTS
a(371) has 1003 decimal digits. - Michael De Vlieger, Jan 27 2016
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..370
EXAMPLE
1/6, 7/30, 11/42, 127/462, 1693/6006, 29243/102102, 561623/1939938, 13019431/44618574, 379503437/1293938646, 11809225121/40112098026, 438235268123/1484147626962, ...
MAPLE
MATHEMATICA
Table[Denominator@ Sum[1/(Prime[i + 1] Prime@ i), {i, n}], {n, 20}] (* Michael De Vlieger, Jan 27 2016 *)
PROG
(PARI) a(n) = denominator(sum(k=1, n, 1/(prime(k)*prime(k+1)))); \\ Michel Marcus, Jan 27 2016
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Apr 25 2014, based on a suggestion from Timothy Varghese.
STATUS
approved