63636

Appears in sequences

• Numbers k such that k^2 is a concatenation of two successive numbers.at n=6A030467
• Palindromes expressible as the sum of 3 consecutive palindromes.at n=38A046498
• Palindromes in which the sum of the internal digits = the sum of the external digits.at n=33A088285
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n and having k ascents of length 4 (0<=k<=floor(n/4)). Also number of ordered trees with n edges which have k vertices of outdegree 4.at n=25A114508
• Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.at n=13A343536