40010

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 40.at n=9A031718
• Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171), with the last leaf implicit, i.e., these words are given without the last trailing zero, except for the null tree which is encoded as 0.at n=25A071153
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 6 and 8.at n=49A136861
• a(n) = 100*n^2 + 10.at n=20A158492
• a(n)! has exactly 10^n trailing zeros (a(n) = -1 if no such number exists).at n=4A173292
• a(n) is the smallest number whose factorial has 10^n trailing zeros.at n=4A173558
• Let x(0)x(1)x(2)... x(q) denote the decimal expansion of n. Sequence lists the numbers n such that the suffix of decimal expansion x(1)x(2)... x(q) is the x(0)-th divisor of n.at n=34A234314
• Consider a number k with m decimal digits, the prefix p of length m-1 and the suffix s of length m-1. The sequence lists the numbers k such that sigma(k) = sigma(p)*sigma(s) where sigma(x) is the sum of the divisors of x.at n=27A244313
• Number of connected, unlabeled, unrooted distance-hereditary graphs on n vertices.at n=9A277862