324899

Appears in sequences

• Numbers that are the product of a pair of twin primes.at n=25A037074
• Product of twin primes of form (4*k+1,4*k+3), k>0.at n=12A071697
• Numbers k such that k+1 and sigma(k)+1 are both perfect squares.at n=34A089954
• Products of two successive primes that can be partitioned in sum of three distinct primes which contain the prime divisors.at n=21A109068
• Numbers that are one less than a square and have exactly 4 divisors.at n=26A134020
• Semiprimes which are sub-perfect powers.at n=39A189045
• 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=28A210503
• Strong Lucas pseudoprimes.at n=33A217255
• Records in A166133.at n=18A256403
• Consider numbers n such that A166133(n) sets a new record and also satisfies A166133(n)=A166133(n-1)^2-1; sequence gives values of A166133(n).at n=3A256423
• 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=28A261080
• Numbers n which are neither a prime nor a square of a prime such that there is no d, 2<=d<=n/2, which divides binomial(n-d-1,d-1) and is not coprime to n.at n=34A269135
• Numbers k such that k^2 + sopfr(k)^2 is a square, where sopfr = A001414.at n=28A386991