51982

Appears in sequences

• Product of twin primes minus 1.at n=15A120875
• Integers k such that for all i > k the largest prime factor of i(i+1)(i+2)(i+3)(i+4)(i+5)(i+6) exceeds the largest prime factor of k(k+1)(k+2)(k+3)(k+4)(k+5)(k+6).at n=21A193948
• Expansion of 1 / (1 - Sum_{i>=1, j>=1} x^(i*(j + 1))).at n=22A327798
• a(n) is the smallest positive k such that k^2 + 1 has 2*n divisors, or -1 if no such k exists.at n=26A353008