5525520

Appears in sequences

• a(n) = denominator(Sum_{k=1..n} 1/(prime(k)-1)).at n=15A128646
• a(n) = denominator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).at n=15A128648
• Numbers n such that the multiplicative group modulo n is the direct product of 8 cyclic groups.at n=21A272598
• Numbers k with record values of the ratio A000005(k)/A246600(k) between the total number of divisors of k and the number of divisors d of k such that the bitwise OR of k and d is equal to k.at n=32A361937
• Terms of A363690 with a record number of divisors.at n=33A363692