2110000

Appears in sequences

• Numbers n such that phi(reversal(n)) = reversal(phi(n)). Ignore leading 0's.at n=34A069282
• Ternary numbers consisting of a run of 2's, then a run of 1's, then a run of 0's.at n=21A371053
• Ternary numbers that are concatenated runs C(1)A(1)B(1)C(2)A(2)B(2)...C(k)A(k)B(k), where A(i) is a run of 1's, B(i) a run of 0's, and C(i) a run of 2's, for i = 1..k.at n=26A371111
• Numbers of the form d_1 d_2 d_3 ... where the sum of their digits multiplied by their digit positions is equal to their number of digits.at n=24A381135