23684

Appears in sequences

• (L(n+2)+2*3^n)/5.at n=10A099164
• Numbers k such that both the k-th and (k+1)-th primes have the same sum of digits squared but different sets of digits.at n=11A109183
• Floor-Sqrt transform of numbers of A004148 (secondary structures).at n=26A192684
• Sum of all the parts in the partitions of n into 8 parts.at n=31A308989
• Triangle read by rows: T(m,n) is the label of the ending square of an (m,n)-leaper (a generalization of a chess knight) when it can no longer move, starting on a board with squares spirally numbered, starting at 1; 1 <= n < m. Each move is to the lowest-numbered unvisited square.at n=29A323750
• Numbers k such that A000110(k) is divisible by k.at n=5A325630
• Number of length n arrays with entries that cover an initial interval of positive integers counting chiral pairs as equivalent, i.e., the arrays are reversible.at n=7A326963
• Number of nonequivalent series-parallel networks with n elements and without unit elements in parallel.at n=17A339153
• Sums of powers of roots of x^4 - 2*x^3 - 6*x^2 + 2*x + 1.at n=8A356569