2106720
domain: N
Appears in sequences
- Expansion of e.g.f. ( (1+x)^x )^x.at n=11A007121
- a(n) = lcm_{k=1..n} (prime(k) + 1).at n=13A085272
- a(n) = lcm_{k=1..n} (prime(k) + 1).at n=14A085272
- Numbers that can be expressed as the difference of the squares of primes in exactly twenty-two distinct ways.at n=1A092018
- Octuple factorial, 8-factorial, n!8, n!!!!!!!!.at n=38A114800
- Octo-factorial numbers (5).at n=5A147626
- Least Niven number for all bases from 1 to n but not for base n+1.at n=31A225427
- a(n) is the smallest k > 6 such that k is a Niven number at least in all the bases from 1 to n.at n=31A226320
- Positions of records in A266342.at n=12A266343
- Positions of records in A266344.at n=19A266345
- 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=31A273379
- Highly composite numbers of class 5 (see comment in A275239).at n=38A275243
- Numbers k for which sigma(k) - 4k exceeds sigma(j) - 4j for all j < k.at n=27A279091
- Least number >= n that is a Niven number in all bases 1 <= b <= n.at n=31A330812
- Least k such that Sum_{i=0..n} k^i / i! is a positive integer.at n=19A332734
- Numbers k where A093653(k)/A000120(k) sets a new record.at n=38A360641
- a(n) = (2*n)!/(n!*a(n-1)), with a(0)=1.at n=10A372987