24180

Appears in sequences

• Unitary-sociable numbers (smallest member of each cycle).at n=3A000173
• Number of sublattices of index n in generic 4-dimensional lattice.at n=19A038991
• Sum of terms in n-th row of A077316.at n=29A077318
• Numbers in the cycle-attractors of length=14 of the function f(x)=A063919(x).at n=14A097030
• a(n) = 4*n*(4*n - 1).at n=39A104188
• a(n) =(A001359[n]^2-1)/2.at n=19A117849
• Number of multiplex juggling sequences of length n, base state <3> and hand capacity 3.at n=6A136783
• Elias omega coded prime numbers represented in decimal.at n=36A147764
• Averages of twin prime pairs which are a sum of averages of two consecutive twin prime pairs.at n=37A160916
• Number of rooted binary leaf-multilabeled trees with n leaves on the label set [4].at n=6A220821
• Numbers n such that n is both the average of some twin prime pair p, q (q = p+2) (i.e., n = p+1 = q-1) and is also the arithmetic mean of the four numbers consisting of the two primes before p and the two primes after q.at n=34A256620
• Numbers that are both interprime and oblong.at n=39A263676
• Numbers n such that the decimal digits of n-phi(n) are a permutation of those of n.at n=42A273799
• Numbers k such that 1/phi(x) + 1/phi(y) = 1/phi(k), for some x + y = k and phi(k) is the Euler totient function of k.at n=27A279621
• Expansion of a q-series used by Ramanujan in his Lost Notebook.at n=32A279715
• Maximum number of 6 sphinx tile shapes in a sphinx tiled hexagon of order n.at n=25A291582
• Number of Lyndon compositions (aperiodic necklaces of positive integers) with sum n and adjacent parts (including the last with the first part) being indivisible (either way).at n=37A318747
• Triangle read by rows: T(n,k) is the number of binary rooted trees with n leaves of exactly k colors and all non-leaf nodes having out-degree 2.at n=24A319541
• Numbers k satisfying gcd(k^2, sigma(k^2)) > sigma(k), where sigma is the sum-of-divisors function.at n=16A322154
• Product of primes indexed by the prime exponents of n!.at n=15A325508