66646

Appears in sequences

• Numbers having four 6's in base 10.at n=22A043516
• Decimal concatenations of the 38 quintuples (d1,d2,d3,d4,d5) with elements in {2,4,6} for which there exists a prime p >= 7 such that the differences between the 6 consecutive primes starting with p are (d1,d2,d3,d4,d5).at n=37A078870
• Smallest multiple of n using all digits of (n-1) at least once and no others; or 0 if no such number exists.at n=46A083958
• Moving the rightmost digit of a number to place it furthest to the left adds 18 to the number.at n=29A363823