1413720

Appears in sequences

• a(n) = 4*n*(4*n-1)*(4*n-2)*(4*n-3).at n=9A054777
• Product of all composite numbers k such that n<k<prime(r) where prime(r-1)<=n, or 1 if this set of k is empty.at n=31A109915
• Smallest number having exactly n triangular divisors.at n=29A130317
• First differences of A047835.at n=7A133708
• a(n) = A006190(n) * A006190(n+2).at n=5A138365
• Triangle read by rows, derived from a(n) = N*a(n-1) + a(n-2).at n=33A138765
• a(1)=1. a(n) is the smallest positive multiple of n that has more divisors than a(n-1) has.at n=33A143176
• (n^2)*(n^2-1)*(n^2-2)*(n^2-3).at n=6A217574
• Ramanujan's largely composite numbers n (A067128) which are not divisible by all the primes < p, where p is the greatest prime divisor of n.at n=28A273379
• Numbers k for which sigma(k) - 4k exceeds sigma(j) - 4j for all j < k.at n=22A279091
• Where records occur in A322373.at n=35A322374
• Smallest number whose divisors have n non-singleton runs.at n=13A328510
• a(n) = product of nonzero entries in row n of A235791.at n=35A339577
• Integers whose number of divisors that are triangular numbers sets a new record.at n=21A350756
• Numbers k such that k and k+1 are both products of 2 triangular numbers.at n=34A356748
• Least positive integer m such that sigma(m)/phi(m) = n + 1/2, where sigma(.) and phi(.) are given by A000203 and A000010, respectively.at n=21A375262