20050

Appears in sequences

• Numbers k that divide 9^k + 7^k.at n=18A045605
• Internal digits of n^2 include digits of n as subsequence.at n=39A046834
• Times in hours, minutes and seconds (to the nearest second) at which the hour and minute hands of an analog clock, if interchanged, continue to indicate some other albeit accurate times, over a complete 12-hour sweep for the slower hand. Leading zeros omitted.at n=24A121577
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 5.at n=36A136882
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 5.at n=25A136897
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.at n=45A136898
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 7.at n=37A136899
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=39A136900
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 9.at n=39A136901
• Number of nX5 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.at n=3A231046
• T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.at n=31A231049
• Number of 4Xn 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero.at n=4A231052
• The 60-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=41A244802
• Number of maximal matchings in the n-gear graph.at n=13A287425
• Number of smooth arithmetical structures on D_n.at n=36A335675
• Numbers k divisible by A004719(k), excluding trivial cases.at n=38A386501