2111111111

Appears in sequences

• Numbers n such that s[n], p[n] and s[n]+p[n] are all prime numbers, where s[n] is the sum of digits of n and p[n] is the product of digits of n.at n=15A065439
• Smallest semiprime ending in exactly n 1's.at n=8A106656
• Consider the Levenshtein distance between k considered as a decimal string and k considered as a binary string. Then a(n) is the greatest number m such that the Levenshtein distance is n or 0 if no such number exists.at n=22A115779