505505

Appears in sequences

• Palindromes of the form k*(k+8).at n=12A028568
• Palindromes that are the product of 5 distinct primes.at n=25A046395
• a(1) = 5, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1).at n=3A082780
• a(1) = 5, a(n) = smallest nontrivial palindromic multiple of a(n-1). a(n) is not equal to a(n-1) or a concatenation of a(n-1) with itself.at n=3A083151
• a(n) is the number of 3-regular 3-hypergraphs on n labeled vertices. (In a 3-hypergraph, each hyper-edge is a proper 3-set; 3-regular implies that each vertex is in exactly 3 hyperedges.)at n=8A110101
• Numbers k such that k and k^2 use only the digits 0, 2, 3 and 5.at n=40A136887
• Numbers in which each digit equals the sum (mod 10) of the other digits.at n=29A226468
• Regular triangle read by rows where T(n,k) is the number of k-regular k-uniform hypergraphs spanning n vertices.at n=30A322706
• Regular triangle read by rows where T(n,k) is the number of k-regular k-uniform hypergraphs spanning n vertices.at n=32A322706