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

Author

Vladimir Shevelev, Oct 11 2012

Keywords

• nonn

Comments

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

Crossrefs

Cf. A217689.

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)).