20205

Appears in sequences

• Sum of 12 positive 9th powers.at n=14A004801
• Number of multigraphs with loops on 3 nodes with n edges.at n=24A050531
• Rounded volume of a regular icosahedron with edge length n.at n=21A071402
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=41A136900
• Half the number of nX6 binary arrays with each element equal to at least two neighbors.at n=6A180755
• Half the number of nX7 binary arrays with each element equal to at least two neighbors.at n=5A180756
• T(n,k)=half the number of nXk binary arrays with each element equal to at least two neighbors.at n=71A180760
• T(n,k)=half the number of nXk binary arrays with each element equal to at least two neighbors.at n=72A180760
• One of the two successive approximations up to 7^n for the 7-adic integer sqrt(-5). These are the numbers congruent to 3 mod 7 (except for the initial 0).at n=6A290806
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=2A295014
• Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.at n=13A298051
• Triangle read by rows giving the number of configurations of n indistinguishable pairs placed on the vertices of the ladder graph P_2 X P_n such that exactly k such pairs are joined by a horizontal edge.at n=40A325754
• Similar to A100787, but alternate with addition and multiplication instead. See Comments section for more information.at n=21A339951