66662

Appears in sequences

• Numbers having four 6's in base 10.at n=26A043516
• Near-repdigit semiprimes with 6 as repeated digit.at n=24A105987
• Numbers k such that k and k^2 use only the digits 2, 3, 4, 6 and 8.at n=17A137072
• a(0) = 0, a(n) = previous term + repunit of length of previous term for n > 0.at n=42A247107
• Numbers that are the sum of 10 consecutive primes and also the sum of 10 consecutive semiprimes.at n=15A284102