OFFSET
1,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A055003(n) - 1. - N. J. A. Sloane, Jul 31 2008
a(n) ~ n (log n)^2. - Charles R Greathouse IV, Apr 07 2015
MATHEMATICA
Table[Prime[Prime[n - 1] - 1] - 1, {n, 2, 60}] (* Vincenzo Librandi, Apr 05 2015 *)
PROG
(PARI) apply(p->prime(p-1)-1, primes(100))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Juri-Stepan Gerasimov, Jul 30 2008
EXTENSIONS
Corrected (382 replaced by 396) and extended by R. J. Mathar, Apr 27 2010
STATUS
approved