OFFSET
1,1
COMMENTS
This violates the OEIS rule that sequences should not depend on the choice of a large arbitrary parameter. Included only because it is in Nagell. - N. J. A. Sloane
REFERENCES
Nagell, T. "Introduction to number theory", Chelsea Publishing Company, 1964, page 52.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
MAPLE
a:= n-> add(`if`(isprime(2*i+1), 1, 0), i=50*n+4999950..50*n+4999999):
seq (a(n), n=1..120); # Alois P. Heinz, Sep 07 2012
MATHEMATICA
f[n_] := PrimePi[10^7 + 100n] - PrimePi[10^7 + 100n - 100]; Table[ f[n], {n, 70}] (* Robert G. Wilson v, Aug 27 2004)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Francesco Guerrieri (francesco.guerrieri(AT)roma1.infn.it), Aug 23 2004
EXTENSIONS
More terms from Robert G. Wilson v, Aug 27 2004
STATUS
approved