656099

Appears in sequences

• Numbers that are the product of a pair of twin primes.at n=30A037074
• Product of twin primes of form (4*k+1,4*k+3), k>0.at n=15A071697
• Numbers that are one less than a square and have exactly 4 divisors.at n=31A134020
• Numbers k that form a primitive Pythagorean triple with k' and sqrt(k^2 + k'^2), where k' is the arithmetic derivative of k.at n=35A210503
• Semiprimes p*q for which p and q are successive primes and their binary representations differ from each other in one bit position only.at n=36A261080
• Numbers k where there are 8 primes between 10*k and 10*k + 30.at n=5A282059
• Numbers k such that k and k+1 are both nonprime-powers whose all distinct prime divisors are consecutive primes (A066312).at n=20A346910
• Numbers k such that k^2 + sopfr(k)^2 is a square, where sopfr = A001414.at n=33A386991