122111

Appears in sequences

• Describe the previous term! (method B - initial term is 1).at n=4A007651
• Composite numbers whose product of digits is 4.at n=40A201016
• Triangle read by rows in which row n lists the binary words of length n over the alphabet {1,2} with no initial repeats.at n=29A211029
• Elements of the Motzkin words sub-operad Motz of TN generated by 00 and 010.at n=30A231872
• Positive numbers n such that (digitsum(n))^2 equals (product of digits(n))^3.at n=15A261778
• Consider the Post tag system described in A284116 (but adapted to the alphabet {1,2}) ; sequence lists the words that terminate in the empty word.at n=44A289675