312312

Appears in sequences

• Numbers k such that k | sigma_6(k) + phi(k)^6.at n=25A055700
• Triangle of binomial(n,k)*(binomial(n+k,k)-binomial(n+k-2,k-1)).at n=51A080721
• a(n) = n*binomial(2*n, n)*Fibonacci(n).at n=7A119701
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3 (and repeat).at n=19A165301
• Non-primitive words on {1,2,3}.at n=41A239018
• Number of endofunctions on [2n] such that the minimal cardinality of the nonempty preimages equals n.at n=7A273325