20500

Appears in sequences

• Numbers whose base-4 representation contains exactly four 0's and four 1's.at n=22A045037
• Internal digits of n^2 include digits of n as subsequence.at n=40A046834
• a(n) = (1/24)*n*(n + 5)*(n^2 + n + 6).at n=24A051743
• Numbers n such that n^2 + 1, n^2 + 3, n^2 + 7 and n^2 + 9 are all primes.at n=5A057015
• a(n) = (1/6)*(2*n - 3)*(n + 2)*(n + 1).at n=41A058373
• Numbers n divisible by exactly two nontrivial permutations (rearrangements) of the digits of n.at n=20A090057
• Number of permutations of n distinct letters (ABCD...) each of which appears 5 times and having n-2 fixed points.at n=40A123296
• A106486-encodings of combinatorial games with value 2.at n=26A125995
• Numbers such that the sum of the factorials of the digits of the fifth power is a square.at n=22A126078
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 5.at n=38A136882
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 5.at n=26A136897
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.at n=47A136898
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 7.at n=38A136899
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=43A136900
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 9.at n=41A136901
• Number of binary strings of length n with no substrings equal to 0011, 0110, or 1100.at n=18A164507
• a(n) = (-1)^n*n*(n+1)*(2*n-5)/6.at n=39A167386
• Numbers n such that phi(n)/n = 16/41.at n=12A176598
• Number of 3-step one space at a time bishop's tours on an n X n board summed over all starting positions.at n=42A187156
• Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.at n=5A196970