13717421

Appears in sequences

• Bisection of A023811, divided by the term position.at n=4A051848
• Floor[concatenation of nine consecutive numbers from n to n+8 divided by 9].at n=1A074999
• Smallest number such that n*a(n) is a concatenation of n consecutive integers; or 0 if no such number exists.at n=8A075000
• a(n) = floor({concatenation 123 ... up to n}/n).at n=8A077147
• (Concatenation of 9n-8, 9n-7, 9n-6, 9n-5, 9n-4, 9n-3, 9n-2, 9n-1 and 9n) divided by 9.at n=0A082256
• Smallest k such that k*n is a number that is a permutation of the digits of first n numbers. a(n) = A083429(n)/n.at n=8A083430
• a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n).at n=8A172496
• a(n) = -4*(((n+1)^(n+1)-(n+1))/((n+1)-1)^2-1)/((-3+(-1)^n)*n).at n=8A221741