122212

Appears in sequences

• k th digit of a(n) = number of different digits within 2 places of k (not including k).at n=18A039987
• k th digit of a(n) is the number of different digits within 3 of k (not including k).at n=16A039989
• n expressed in Fibonacci binary-like number system using only 1's and 2's.at n=33A108960
• Sorted list of strings that can be obtained by starting with 12 and repeatedly doubling any substring in place.at n=29A130838
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.at n=9A150280
• Numbers for which the sum of reciprocals of square of digits is an integer.at n=15A182452
• 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=33A211029
• Good's example of a "Standard List" of prime words over the alphabet {1,2}.at n=21A212659
• Reversed shortest (x+1,2x)-code of n.at n=24A233137