22206

Appears in sequences

• Numbers k such that 2*10^k + 5*R_k + 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=14A099006
• Triangle T, read by rows, equal to the matrix cube of triangle A113084, which satisfies the recurrence: A113084(n,k) = [A113084^3](n-1,k-1) + [A113084^3](n-1,k).at n=18A113090
• Number of strings of numbers x(i=1..6) in 0..n with sum i^2*x(i)^2 equal to n^2*36.at n=35A184244
• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape L; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=51A247704
• Let v = list of denominators of Farey series of order n (see A006843); a(n) = sum of products of adjacent terms of v.at n=19A278046
• Triangle read by rows: first row is 2; given row k, define the elements of row k+1 as the (sorted) elements derived from row k by two recursion rules: (i.) if x is in row k, then (x+5)^2 is in row k+1; (ii.) if x^2 is in row k, then x is in row k+1.at n=24A296142