253955520

Appears in sequences

• Group the natural numbers so that every 2n-th group product is divisible by the single number in the next group. (1), (2,3,4,5), (6), (7,8,9,10,11), (12), (13,14,15,16,17,18,19),(20), (21,22,23,24,25,26,27),(28),... Sequence contains the product of terms in the 2n-th group.at n=2A109897
• Products of 7 consecutive integers.at n=19A159083
• a(n) = v(n+1)/v(n), where v=A203472.at n=6A203473
• Indices k of records of low value in the ratios A319696(k)/A000005(k) between the number of distinct values of the Euler totient function applied to the divisors of k and the number of divisors of k.at n=31A328859
• a(n) = (n + A332558(n))!/(n-1)!.at n=12A332560
• a(n) is the least integer that can be expressed as the difference of two n-gonal numbers in exactly n ways.at n=21A338105
• Numbers k at which phi(tau(k))/tau(phi(k)) reaches a record high.at n=10A346574
• a(n) = n! / floor(2n/3)!.at n=19A374647
• a(n) = Product_{k=0..n-1} (2*n+k-1).at n=7A384261