167571

Appears in sequences

• Composite numbers with four prime factors (not necessarily distinct) whose concatenation yields a palindrome.at n=33A046453
• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 25 (most significant digit on right).at n=17A061978
• G.f. A(x) satisfies: Sum_{n>=0} A(x)^((n+1)^2) * x^n = Sum_{n>=0} (1 + A(x)^(n+2))^n * x^n.at n=8A326287