1121221

Properties

Appears in sequences

• Primes that contain digits 1 and 2 only.at n=15A020450
• Primes with digital product = 8.at n=17A107694
• Numbers that eventually reach 1 under "x -> sum of 5th power of digits of x".at n=13A219112
• Prime numbers whose digits are k+1 1's and k 2's for some k >= 1.at n=5A276461
• The word 1 belongs to the sequence, and whenever a word w belongs to the sequence, then the words consisting of 1's and 2's whose run lengths transform equals w also belong to the sequence.at n=29A376637
• Prime numbersat n=87266