22151

Appears in sequences

• Centered octahedral numbers (crystal ball sequence for cubic lattice).at n=25A001845
• Trajectory of 1 under map n->13n+1 if n odd, n->n/2 if n even.at n=28A033964
• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 23 (most significant digit on right).at n=8A061976
• Reverse of smallest prime factor of k = largest prime factor of k+1; a(1)=1.at n=21A071392
• Odd numbers n for which 17 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=28A112077
• Asymmetric rhythm cycles (patterns): binary necklaces of length 2n subject to the restriction that for any k if the k-th bead is of color 1 then the (k+n)-th bead (modulo 2n) is of color 0.at n=11A115114
• Number of imprimitive (periodic) asymmetric rhythm cycles: ones having nontrivial shift automorphisms. Asymmetric rhythm cycles (A115114): binary necklaces of length 2n subject to the restriction that for any k if the k-th bead is of color 1 then the (k+n)-th bead (modulo 2n) is of color 0.at n=35A115116
• Number of partitions of n having no parts with multiplicity 5.at n=38A184640
• a(n) = (9*n^3 + 5*n)/2.at n=16A230018
• Numbers k such that replacing each digit d in the decimal expansion of k with d^3 yields a prime each time, when done recursively three times.at n=14A316982
• Number of n-th generation nodes of a rooted binary tree whose m-th node has exactly A000002(m) descendants, where A000002 is the Kolakoski sequence.at n=25A329758