5702400

Appears in sequences

• Numbers k such that phi(sigma(k)) = k.at n=15A001229
• Number of permutations of an n-set containing a 7-cycle.at n=11A029574
• E.g.f.: x^4*log(-1/(-1+x)).at n=11A052778
• a(n) is the number of sets of natural numbers [a,b,c,d,e] that can be produced with the numbers [0..n] such that the values of all the distinct parenthesized expressions of a-b-c-d-e are different.at n=23A054026
• Numbers k such that k = phi(sigma(phi(sigma(k)))).at n=31A067883
• Numbers k such that k = phi(sigma(phi(sigma(phi(sigma(k)))))).at n=30A067884
• Denominator of (5/2)*Sum_{i=1..n} (-1)^(i-1)/(i^3*C(2*i,i)).at n=6A089639
• Sum of the non-unitary divisors of A064115(n) (or of 1+A064115(n)).at n=25A103846
• Triangular sequence based on A002301 and the alternating groups a prime -adic: t(n,m)=n!/Prime[m] for n>=Prime[m].at n=30A129925
• The Gauss factorial n_7!.at n=11A232983
• Numbers n such that k!/n is prime for some k.at n=28A242516
• a(n) = prime(n+1)! / prime(n).at n=3A260754
• Denominators of a semi-convergent series leading to the third Stieltjes constant gamma_3.at n=6A262387
• Triangle read by rows: denominators of c_{n,k}, n >= 0, k = 0..n, used in the proof that Zeta(3) is irrational.at n=27A303989
• Maximum divisor of n! with distinct prime multiplicities.at n=11A336616
• Sum of the divisors of A000129(n) (Pell numbers).at n=17A363829
• Irregular triangle T read by rows: T(n, k) gives the number of permutations of [n] = {1, 2, ..., n} with a cycle of length m = floor(n/2) + k = A138099(n, k), for 1 <= k <= n - floor(n/2) = ceiling(n/2).at n=31A364317
• a(n) is the denominator of the probability that a particular one of the A335573(n+1) fixed polyominoes corresponding to the free polyomino with binary code A246521(n+1) appears in the version of the Eden growth model described in A367671 when n square cells have been added.at n=49A367676
• Numbers which are the minimum of a cycle in the map x -> phi(sigma(x)).at n=33A376256
• The product of the first n terms of A383217.at n=9A383218