22141

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=15A031864
• Numbers having four 3's in base 9.at n=13A043468
• a(n) = (n + 2)*(2*n^2 - n + 3)/6.at n=40A056520
• If n mod 2 = 0 then (3^(n+3)-19)/8 else (3^(n+3)-1)/8.at n=8A116973
• a(n) = 13*n^2 + 7*n + 1.at n=40A168240
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 613", based on the 5-celled von Neumann neighborhood.at n=26A273243
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 2*x + (1-4*k^2)*x^2).at n=51A307847
• a(n) = Sum_{k=1..n} (k/gcd(n, k))^2.at n=40A332654
• A triple of positive integers (n,p,k) is admissible if there exist at least two different multisets of k positive integers, {x_1,x_2,...,x_k} and {y_1,y_2,...,y_k}, such that x_1+x_2+...+x_k = y_1+y_2+...+y_k = n and x_1x_2...x_k = y_1y_2...y_k = p. For each n, let A(n) = {(p,k):(n,p,k) is admissible for some k}; then a(n) = |A(n)|.at n=46A334246
• Centered 27-gonal numbers.at n=40A389797