50000001

Appears in sequences

• Hexamorphic numbers: k such that the k-th hexagonal number ends with k.at n=40A039594
• Numbers m that divide the concatenation of m+1 and m+2.at n=26A069860
• Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=33A077292
• a(n) = 5*10^n + 1.at n=7A199685