A217691 Primes in A217689.

2, 3, 19, 23, 31, 43, 59, 61, 73, 83, 103, 107, 109, 113, 151, 163, 179, 181, 197, 199, 233, 241, 269, 271, 277, 281, 283, 313, 317, 349, 353, 379, 383, 409, 421, 433, 443, 449, 461, 463, 503, 509, 523, 571, 577, 593, 599, 601, 617, 619, 643, 647, 659, 661, 677

Offset

1,1

Comments

Apart from the initial 2, the odd terms of A217689. - M. F. Hasler, Oct 19 2012

Links

Table of n, a(n) for n=1..55.

Formula

If A(n) is the number of terms not exceeding n, then heuristically A(n) is equivalent to log(2)*pi(n), as n tends to infinity. Practically, an approximation of A(n)is given by the expression n*log(2)/log(n*log(n)).

Crossrefs

Cf. A217689.

Sequence in context: A082012 A059675 A128353 * A109418 A038957 A141750

Adjacent sequences: A217688 A217689 A217690 * A217692 A217693 A217694

Keyword

nonn

Author

Vladimir Shevelev, Oct 11 2012

Status

approved