OFFSET
1,1
COMMENTS
The sum of the reciprocals appears to converge.
MATHEMATICA
Table[Prime[(n(n+1))/2+n], {n, 50}] (* Harvey P. Dale, Jan 04 2011 *)
PROG
(PARI) triprimes(n) = { sr = 0; for(j=1, n, x = j*(j+1)/2 +j; z = prime(x); sr+=1.0/z; print1(z" "); ); print(); print(sr); }
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Dec 20 2002
EXTENSIONS
Offset changed to 1 by Alois P. Heinz, May 18 2019
STATUS
approved