210101

Properties

Appears in sequences

• Primes with consecutive digits that differ exactly by 1.at n=23A048398
• a(1) = 1; a(n+1) is the smallest number > a(n) which differs from it at every digit.at n=46A068860
• Smallest n-digit prime with property that digits alternate in parity.at n=5A068876
• Primes whose decimal representation also represents a prime in base 3.at n=27A089981
• Largest of seven consecutive primes whose sum of digits is prime.at n=21A106721
• Largest of eight consecutive primes whose sum of digits is prime.at n=8A106724
• a(1) = 1; thereafter a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that any six consecutive digits in the sequence sum up to a prime.at n=28A152606
• Terms in A048398 ending with 1.at n=3A185893
• Number of 0..6 arrays of length n with each element differing from at least one neighbor by 1 or less.at n=7A221594
• Smallest prime ending in n alternating decimal digits 0 and 1.at n=4A377370
• a(0) = 0; thereafter a(n) is the lexicographically earliest missing nonnegative integer such that the digits in the sequence (ignoring the commas) alternate in parity.at n=13A377919
• Prime numbersat n=18815