162165

Appears in sequences

• Lucky numbers that are decimal concatenations of n with n + 3.at n=18A032653
• Triangular numbers whose external digits as well as internal digits form triangular numbers.at n=29A077368
• Smallest n-digit triangular number whose external digits as well as internal digits form triangular numbers, or -1 if no such number exists.at n=5A077369
• a(n) is the number of binary strings of length n such that no subsequence of length 5 or less contains 3 or more ones.at n=24A120118