A175711 Primes p such that p-th semiprime=r*k and r>=p>=k.

2, 3, 5, 7, 11, 29, 41, 43, 47, 53, 59, 67, 73, 97, 107, 109, 113, 137, 149, 151, 167, 179, 191, 193, 211, 227, 229, 233, 241, 263, 269, 277, 281, 307, 311, 317, 359, 373, 379, 383, 389, 449, 457, 487, 491, 499, 521, 563, 571, 577, 587, 593, 607, 631, 661, 677

Offset

1,1

Comments

a(1)=2 because 2nd semiprime=3*2 and 3>2=2, a(2)=3 because 3rd semiprime=3*3 and 3=3=3, a(3)=5 because 5th semiprime=7*2 and 7>5>2.

Links

Table of n, a(n) for n=1..56.

Crossrefs

Cf. A084126, A084127.

Sequence in context: A165682 A296924 A343423 * A099160 A181503 A028911

Adjacent sequences: A175708 A175709 A175710 * A175712 A175713 A175714

Keyword

nonn

Author

Juri-Stepan Gerasimov, Aug 12 2010

Status

approved