1,3

See A035158, which is the main entry for this function.

The old entry with this sequence number was a duplicate of A083235.

Table of n, a(n) for n=1..76.

a(n) ~ n by the prime number theorem. - Charles R Greathouse IV, Aug 02 2012

Sequence in context: A057144 A198332 A080606 * A250983 A070320 A124195

Adjacent sequences: A083532 A083533 A083534 * A083536 A083537 A083538

nonn

N. J. A. Sloane, Oct 02 2008

approved