55000

Appears in sequences

• a(n) = n*(n-1)^4/2.at n=11A019583
• Triangle T(n,k) of number of digraphs with a source and a sink on n labeled nodes and k arcs, k=0,1,..,n*(n-1).at n=31A057271
• Numbers whose square has more than 2/3 of its digits the same.at n=36A060813
• Numbers n such that A001414(n) = sum of composites from the smallest prime factor of n to the largest prime factor of n.at n=27A074053
• a(n) = A069537(n)/2.at n=14A088404
• Average of positive multiples of 3 with n decimal digits, rounded down.at n=4A110431
• Least number k such that (k*M(n))^2 + k*M(n) - 1 is prime with M(i)=i-th Mersenne prime.at n=27A121370
• Numbers k such that k and k^2 use only the digits 0, 2, 3 and 5.at n=23A136887
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 7.at n=26A136889
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 8.at n=31A136890
• Duplicate of A121370.at n=27A137908
• Numbers divisible by the sum of their digits, and by the sum of their digits squared, by the sum of their digits cubed and by the sum of 4th powers of their digits.at n=25A169662
• Numbers whose decimal expansion contains only 0's and 5's.at n=24A169964
• Numbers such that each digit is the sum of two or more other digits.at n=19A203591
• Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.at n=8A207840
• Integers expressible as x^3 + 2*y^3 (x, y > 0) in two ways.at n=16A219725
• Numbers in which each digit equals the sum (mod 10) of the other digits.at n=19A226468
• Number of (n+1)X(2+1) 0..3 arrays colored with the maximum plus the upper median of every 2X2 subblock.at n=1A236598
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays colored with the maximum plus the upper median of every 2X2 subblock.at n=4A236601
• A total of n married couples, including a mathematician M and his wife, are to be seated at the 2n chairs around a circular table, with no man seated next to his wife. After the ladies are seated at every other chair, M is the first man allowed to choose one of the remaining chairs. The sequence gives the number of ways of seating the other men, with no man seated next to his wife, if M chooses the chair that is 5 seats clockwise from his wife's chair.at n=9A258665