A089611 Number of primes between n^2 and (n+1/3)^2.

0, 1, 1, 1, 0, 1, 1, 1, 1, 2, 1, 2, 1, 2, 3, 2, 1, 1, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 3, 3, 3, 3, 5, 2, 3, 5, 2, 4, 3, 6, 3, 4, 5, 2, 4, 5, 4, 3, 3, 3, 4, 6, 4, 3, 4, 4, 5, 4, 4, 6, 4, 6, 4, 5, 7, 5, 6, 7, 6, 7, 5, 5, 3, 8, 8, 7, 2, 7, 7, 4, 7, 4, 4, 5, 5, 4, 8, 5, 6, 5, 7, 4, 8, 8, 6, 6, 11, 8, 9, 5, 7, 7, 8, 8, 9

Offset

1,10

Links

Table of n, a(n) for n=1..105.

Prog

(PARI) pbetweensq2(n) = { for(x=1, n, c=0; for(y=floor(x)^2, (x+1/3)^2, if(isprime(y), c++) ); print1(c", ") ) }

Crossrefs

Sequence in context: A097306 A102632 A094076 * A248470 A082067 A082061

Adjacent sequences: A089608 A089609 A089610 * A089612 A089613 A089614

Keyword

easy,nonn

Author

Cino Hilliard, Dec 30 2003

Status

approved