5000000001

Appears in sequences

• Numbers m that divide the concatenation of m+1 and m+2.at n=32A069860
• Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=38A077292
• a(n) = 5*10^n + 1.at n=9A199685