A089332 a(n) = floor(10*(primepi((n+1)^2) - primepi(n^2) - 2*n/sqrt(n)+4)).

30, 15, 31, 17, 23, 10, 26, 13, 20, 17, 5, 22, 30, 7, 15, 12, 20, 18, 16, 4, 32, 20, 8, 16, 24, 12, 10, 28, 16, 25, 13, 21, 10, 8, 36, 25, 33, 21, 0, 28, 17, 35, 4, 32, 51, 0, 8, 47, 55, 14, 23, 1, 10, 59, 17, 46, 45, 13, 52, 31, 20, 38, 27, 26, 45, 3, 82, 21, 20, 39, 37, 46, 85, 4, 43, 92, -9, 60, 48, 57, 26, 15, 64, 73, 32, 31, 50, 49, 38

Offset

1,1

Links

Table of n, a(n) for n=1..89.

Formula

a(n) = floor(10*(primepi((n+1)^2) - primepi(n^2) - 2*n/sqrt(n)+4)).

Mathematica

digits=5*200
a=Table[Floor[10*(PrimePi[(n+1)^2]-PrimePi[n^2]-2*n/Sqrt[n]+4)], {n, 4, digits}]

Crossrefs

Sequence in context: A070293 A194709 A070657 * A040873 A070891 A033971

Adjacent sequences: A089329 A089330 A089331 * A089333 A089334 A089335

Keyword

sign,less

Author

Roger L. Bagula, Jan 03 2004

Status

approved