22896

Appears in sequences

• Numbers n such that n | sigma_13(n).at n=31A055717
• Smallest number m such that m and the product of digits of m are both divisible by 8n, or 0 if no such number exists.at n=53A073912
• Fifth binomial transform of binomial(n+2, 2).at n=5A081907
• Numbers k such that 2^k - 1 is divisible by (k-1).at n=21A087965
• a(1) = 1, a(2) = 2; for n >= 2, a(n+1) = a(n) + sum of the unique prime factors of a(n).at n=31A096460
• Expansion of (1-6*x-sqrt((1-6*x)^2-4*6*x^2))/(2*6*x^2).at n=5A107266
• Numbers k such that k + sigma(k) + phi(k) is a square.at n=31A116009
• a(n) = a(n-2) + a(n-4) + a(n-5) + a(n-7) + a(n-8) + a(n-10) for n >= 10, with a(0) = ... = a(9) = 1.at n=33A122762
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1111-0100 pattern in any orientation.at n=14A146375
• 6 times octagonal numbers: a(n) = 6*n*(3*n-2).at n=36A153796
• Numbers of the form p^4*q^3*r where p, q, and r are distinct primes.at n=28A179698
• The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.at n=26A179989
• Logarithms (cf. A179989) f:{1,...,n}->Z/nZ such that either (i) n is odd or (ii) n is even and f(m) is even whenever m divides n/2.at n=26A179990
• Number of permutations of 0..(n-1) representable as consecutive sums of 2 adjacent elements of a sequence of n+1 nonnegative integers.at n=8A180205
• Least number k such that kn + 1 is a prime dividing prime(n)^n - 1.at n=30A191549
• Molecular topological indices of the pan graphs.at n=34A192836
• (n-1)-st elementary symmetric function of the first n terms of (1,2,3,1,2,3,1,2,3,...).at n=13A203162
• Smallest integer k such that k*n+1 is a prime dividing (n^n)^2 + 1.at n=9A208400
• sigma(n) is an additive inverse of n modulo phi(n).at n=17A235989
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 457", based on the 5-celled von Neumann neighborhood.at n=15A282361