148647496

Appears in sequences

• Numbers k such that k^2 + 1 = p*q, p < q primes and q-p is a power of 2.at n=8A238947
• a(n) is the least k such that k^2 + 1 is a semiprime p*q, p < q, and (q - p)/2^n is prime.at n=25A258780