22211

Appears in sequences

• Append d digits d after each digit d in decimal expansion of n.at n=21A048377
• n written efficiently in natural numbers base, i.e., in form ...wxyz where n = 1*z + 2*y + 3*x + 4*w + ... with z <= 1, y < 2, x < 3, w < 4, ...at n=26A055611
• Numbers in Morse code, with 1 for a dot, 2 for a dash and 0 between digits/letters.at n=8A060109
• Numbers whose product of decimal digits equals its sum of binary digits.at n=33A064003
• The zero-free, right-to-left factorial walk encoding for each rooted plane tree encoded by A014486. Sequence A071155 shown with factorial expansion (A007623).at n=31A071157
• Left-to-right binary enumeration.at n=37A081242
• Positions of zero in the infinite audioactive word, A088205, which shifts left under "Look and Say" method A, starting with a(1)=0.at n=29A088206
• Digit reversal of A096299(n).at n=19A096104
• Ternary equivalents of A109682.at n=4A109684
• Numbers k such that the number of divisors of k equals both the sum and the product of digits of k in base 10.at n=6A113761
• The first 10 digits of the fifth root of n contain the digits 0-9.at n=12A119520
• Number of sequences with terms 1, 2 or 3 summing to n with no three consecutive 1's.at n=19A123908
• Least early bird number of order n.at n=9A133652
• Numbers n with property that for each single digit d of the base 3 expansion of n, we can also see the base 3 expansion of d^2 as a substring. Also n may not contain any 0 digits.at n=31A135464
• a(n) = RMS( A141393(0) through A141393(n) ).at n=18A141394
• Products of three distinct happy primes A035497.at n=30A154717
• Squares in lunar arithmetic in base 3 written in base 3.at n=25A171396
• The number of disconnected k-regular simple graphs on 2k+4 vertices.at n=54A184324
• Numbers of rank 11 in the poset of lunar numbers.at n=36A191753
• List of primitive words over the alphabet {1,2}.at n=49A213969