OFFSET
1,1
COMMENTS
Theorem: a(n) > 0. Proof: Use p(n+1) <= 2 p(n)^2 for n > 4. (See Sándor et al.) QED
REFERENCES
József Sándor, Dragoslav S. Mitrinovic, and Borislav Crstici, Handbook of Number Theory I, Springer Science & Business Media, 2005, Chapter VII, p. 247, section VII.18.b.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
MATHEMATICA
With[{p = Prime[Range[50]]}, 2 * p[[1;; -3]] * p[[3;; -1]] - p[[2;; -2]]^2] (* Amiram Eldar, Apr 25 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 10 2019
STATUS
approved