218491

Appears in sequences

• Numbers k such that k | 5^k + 4^k + 3^k + 2^k.at n=30A057249
• 7th binomial transform of (1,1,0,0,0,0,...).at n=6A081107
• Main diagonal of array A089944, in which the n-th row is the n-th binomial transform of the natural numbers.at n=6A089945
• Numbers of the form (7^i)*(13^j).at n=21A108056
• A triangular sequence of coefficients based on a skip prime prime power sequence: t(n,m)=Prime[m + 1]^n*Prime[m + 3]; qualified so the m=0 and n=0 terms are well-defined.at n=18A141500
• Numbers whose arithmetic derivative is equal to Euler totient function: n' = phi(n).at n=7A166374
• Number of 0..n arrays x(0..5) of 6 elements with each no smaller than the sum of its previous elements modulo (n+1).at n=11A200255
• Number T(n,k) of endofunctions f on [n] that are self-inverse on [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=29A245348
• Triangular array read by rows: T(n,k) is the number of pre-orders on an n-set with exactly k connected components in its digraph representation, n>=1, 1<=k<=n.at n=23A247232
• Number of independent vertex sets (and vertex covers) in the 2n-crossed prism graph.at n=7A287327
• Numbers of the form (q1^b1)(q2^b2)(q3^b3)(q4^b4)(q5^b5)... where q1=7, q2=13, q3=19, q4=31, q5=37, ... (A002476) and b1>=b2>=b3>=b4>=b5...at n=18A344473
• Numbers k such that A345048(k) is equal to A345049(k).at n=11A345051