20122

Appears in sequences

• Primes in ternary.at n=40A001363
• Numbers k such that the continued fraction for sqrt(k) has period 89.at n=21A020428
• Primes of form 4k+3 written in base 3.at n=21A072805
• A014486-indices of A083932-trees.at n=37A083934
• Positive numbers of the form x^5-10x^3*y^2+5x*y^4 (where x,y are integers and y>x).at n=16A135792
• Numbers of the form x^5-10x^3*y^2+5x*y^4 (where x,y are integers).at n=22A135793
• Expansion of 1/(x^k*(1-x-3*x^(k+1))) for k=7.at n=29A143458
• Numbers 3*n + 2 written in base 3.at n=59A190642
• Values of y such that x^2 + y^2 = 53^n with x and y coprime and 0 < x < y.at n=4A230760
• Not necessarily palindromic primes of which initial and terminal digits are identical, as written in base 3.at n=17A231278
• Number of compositions of n with exactly six descents.at n=4A241631
• Irregular triangle read by rows: T(n,k) is the number of n X n tic-tac-toe positions (up to rotation and reflection) with k tokens (i.e., after k plays) which occur in a game (n > 0, 0 <= k <= n^2).at n=23A317575