102604

Appears in sequences

• Numbers k such that the number of divisors of k equals the number of anti-divisors of k.at n=19A073694
• 2n^4+6n^2+4 = 2(n^2+1)(n^2+2).at n=14A120571
• Numbers k such that k^2 divides 15^k-1.at n=36A128395
• Long leg B of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, s=a+b+c, s-+1 are primes.at n=20A155174