OFFSET
1,1
COMMENTS
Many a(n), such as 3,11,29,59,101,239,569,1061,1481,1721,4889.., are primes of form p(1)+...+p(k)+1 where p(i) =i-th prime A053845. It appeares that all primes of this form are presented in a(n) in their natural order.
FORMULA
MATHEMATICA
Numerator[Table[Det[DiagonalMatrix[Table[1/Prime[i], {i, 1, n}]]+1], {n, 1, 70}]]
Table[Numerator[(1+Sum[Prime[k], {k, 1, n}])/Product[Prime[k], {k, 1, n}]], {n, 1, 100}]
CROSSREFS
KEYWORD
frac,nonn
AUTHOR
Alexander Adamchuk, Jul 08 2006, Aug 19 2006
STATUS
approved