1,2

Table of n, a(n) for n=1..62.

There is no odd prime between 0 and 2. There are three odd primes between 2 and 9.

Join[{0}, Differences[PrimePi[Table[n (n + 1)^2/2, {n, 1, 62}]]]] (* T. D. Noe, Apr 09 2012 *)

Cf. A006002.

Sequence in context: A050083 A081175 A269110 * A094598 A329003 A263654

Adjacent sequences: A182047 A182048 A182049 * A182051 A182052 A182053

nonn

Gerasimov Sergey, Apr 08 2012

approved