412163

Appears in sequences

• Numbers that are the product of a pair of twin primes.at n=28A037074
• Product of twin primes of form (4*k+1,4*k+3), k>0.at n=14A071697
• Numbers k such that k+1 and sigma(k)+1 are both perfect squares.at n=37A089954
• Numbers k equal prime(n)*prime(n+1) such that k+1 is a square and k-1 is even semiprime.at n=10A107423
• Semiprimes which are equal to product of two successive primes and also to sum of three successive primes.at n=8A133126
• Numbers that are one less than a square and have exactly 4 divisors.at n=29A134020
• Members of A159053 which are not multiples of 3.at n=16A159054
• 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=31A210503
• Lengths of binary representations of prime Fibonacci numbers.at n=40A215367
• Smallest i such that prime(n) divides gcd(sigma(i), phi(i)) (cf. A009223).at n=27A222714
• 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=30A261080
• Numbers k such that k^2 + sopfr(k)^2 is a square, where sopfr = A001414.at n=31A386991