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A122258 Number of Pierpont primes <= n. 2
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 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

COMMENTS

Partial sums of A122257;

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

LINKS

Eric Weisstein's World of Mathematics, Pierpont Prime

CROSSREFS

Sequence in context: A143489 A130249 A061071 * A068509 A070319 A057142

Adjacent sequences:  A122255 A122256 A122257 * A122259 A122260 A122261

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 29 2006

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Last modified February 17 18:41 EST 2012. Contains 206074 sequences.