A122258 Number of Pierpont primes <= n.

0, 1, 2, 2, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10

Offset

1,3

Comments

Partial sums of A122257;

a(n) <= A000720(n); a(n) <= A071521(n).

Links

Table of n, a(n) for n=1..102.

Eric Weisstein's World of Mathematics, Pierpont Prime

Crossrefs

Sequence in context: A130249 A286105 A061071 * A332220 A263089 A340611

Adjacent sequences: A122255 A122256 A122257 * A122259 A122260 A122261

Keyword

nonn

Author

Reinhard Zumkeller, Aug 29 2006

Status

approved