OFFSET
0,1
COMMENTS
More generally one may consider the sequence S(n, m) = prime(n*(n+1)/2+m+1), for m=1, 2, 3...
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
MATHEMATICA
Table[Prime[(n (n + 1))/2 + 4], {n, 0, 60}] (* Vincenzo Librandi, Jun 08 2016 *)
PROG
(PARI) triprimes(n, m) = { sr = 0; for(j=m, n, x = j*(j+1)/2+m+1; z = prime(x); sr+=1.0/z; print1(z" "); ); print(); print(sr); }
(Magma) [NthPrime(n*(n+1) div 2 + 4): n in [0..50]]; // Vincenzo Librandi, Jun 08 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Cino Hilliard, Dec 20 2002
STATUS
approved