12121211

Properties

Appears in sequences

• Primes that contain digits 1 and 2 only.at n=25A020450
• Underline all even terms; concatenations of underlined terms and of non-underlined terms both equal the concatenation of the entire sequence. This is the lexicographically earliest such sequence without duplicate terms and with an even digit among the first two terms.at n=22A307312
• Prime numbersat n=795470