66660

Appears in sequences

• Numbers having four 6's in base 10.at n=24A043516
• Sum of all digit permutations of the concatenation of first n numbers.at n=3A071268
• a(1)=3; for n>1, a(n) is least number such that a(n) > a(n-1) and a(1)^2+...+a(n)^2 is a square.at n=9A127689
• Numbers k such that k and k^2 use only the digits 0, 3, 4, 5 and 6.at n=18A136927
• Numbers whose set of base-10 digits is {0,6}.at n=30A204093
• List the positions of all digits 6 in the concatenation of all terms, not necessarily in order. This is the lexicographically earliest such sequence.at n=32A210420
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 158", based on the 5-celled von Neumann neighborhood.at n=8A270334