1000000021

Appears in sequences

• Primes whose sum of digits is 4.at n=25A062339
• Smallest n-digit prime with minimum digit sum.at n=9A069663
• Smallest n-digit prime whose external digits as well as internal digits form a prime, or 0 if no such number exists.at n=9A077361
• Smallest n-digit squarefree number whose internal as well as external digits form a squarefree number greater than 1; or 0 if no such number exists.at n=9A077379
• Primes of form 10^n + 21.at n=2A138861
• Array read by rows: row n lists the first 3 primes with n digits.at n=29A139053
• Primes sorted on digit sums, then on the primes.at n=29A157715