1,1

The number of primes in this sequence is infinite.

Table of n, a(n) for n=1..31.

37 is the first irregular prime, 613 is the 37th irregular prime, i.e. iprime[iprime[1]] = 613 and 12923 is the 613th irregular prime.

Sequence in context: A162895 A256746 A086004 * A246890 A145333 A190468

Adjacent sequences: A090884 A090885 A090886 * A090888 A090889 A090890

easy,nonn

Cino Hilliard, Feb 12 2004

approved