OFFSET
1,1
COMMENTS
This sequence is infinite.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Cino Hilliard, file irregprimes.txt, Feb 13, 2004. [cached from Yahoo group B2LCC/files/Bernoulli/]
Mohammad Amin Shokrollahi, Tables.
FORMULA
EXAMPLE
37 is the first irregular prime, 613 is the 37th irregular prime, i.e., iprime(iprime(1)) = 613, so a(1) = 613.
PROG
(PARI) \\ Irregular prime-indexed primes. Download the linked file (e.g. with "wget https://oeis.org/a090869.txt") into the gp working directory, and start a new PARI session.
iprime = readvec("your_path/a090869.txt");
ipips(n) = for(x=1, n, y=iprime[iprime[x]]; print1(y ", "));
ipips(50) \\ Michel Marcus, Georg Fischer Nov 14 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Feb 12 2004
STATUS
approved