OFFSET
0,3
COMMENTS
a(n)>=1 because there is always a 3*prime(i) between n^3 and (n+1)^3 for n>0.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
EXAMPLE
a(3)=3 because 2^3 and 3^3 there are three 3*prime(i): 3*prime(2)=3*3, 3*prime(4)=3*5 and 3*prime(5)=3*7.
MATHEMATICA
f[n_] := PrimePi[Floor[n^3/3]]; Table[f[(n + 1)] - f[n], {n, 0, 60}]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Apr 10 2005
EXTENSIONS
Edited and extended by Ray Chandler, Apr 16 2005
STATUS
approved