A245590 Primes p such that p^2 + 6 is a semiprime.
2, 3, 7, 17, 23, 41, 47, 53, 59, 101, 149, 157, 173, 179, 193, 211, 229, 233, 239, 241, 251, 311, 347, 349, 353, 359, 373, 379, 383, 389, 409, 421, 439, 443, 457, 479, 499, 509, 521, 541, 571, 577, 599, 619, 641, 661, 691, 701, 719, 751, 761, 769, 809, 823, 829
Offset: 1
Examples
7 is in the sequence because it is prime and 7^2 + 6 = 55 = 5 * 11, which is semiprime. 23 is in the sequence because it is prime and 23^2 + 6 = 535 = 5 * 107, which is semiprime.
Links
- K. D. Bajpai, Table of n, a(n) for n = 1..11200