66667

Appears in sequences

• Numbers whose square has its digits in nondecreasing order.at n=49A028819
• a(n)^2 is smallest square starting with a string of n 4's.at n=4A034984
• Numbers having four 6's in base 10.at n=30A043516
• Numbers k such that k^2 contains only digits {4,8,9}.at n=10A053966
• Number of Fibonacci numbers A000045(k), k <= 10^n, which end in 4.at n=6A067275
• Duplicate of A067275.at n=6A073552
• Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).at n=21A077292
• Numbers n > 2 such that n divides the concatenation of n-2 and n-1.at n=5A088797
• Centered hexamorphic numbers: the k-th centered hexagonal number, 3k(k-1)+1, ends in k.at n=23A094534
• Near-repdigit semiprimes with 6 as repeated digit.at n=25A105987
• Numbers k such that the k-th triangular number contains only digits {2,7,8}.at n=11A119179
• Numbers whose square starts with 5 identical digits.at n=4A119866
• Numbers k such that k and k^2 use only the digits 4, 6, 7, 8 and 9.at n=12A137145
• Numbers n such that the decimal representation of n is contained as substring in that of the n-th pentagonal number.at n=18A179782
• Integers n such that digits in n and n^2 are in nondecreasing order.at n=40A234841
• For k in {2,3,...,9} define a sequence as follows: a(0)=0; for n>=0, a(n+1)=a(n)+1, unless a(n) ends in k, in which case a(n+1) is obtained by replacing the last digit of a(n) with the digit(s) of k^2. This is k(8).at n=27A237345
• Numbers of the form (10^a + 10^b + 1)/3.at n=20A237424
• Numbers which have only digits 6 and 7 in base 10.at n=31A256292
• Numbers n with the property that n^2 contains a sequence of four or more consecutive 8's.at n=30A301938
• Numbers k such that k*(k-1) is composed of exactly two different decimal digits.at n=31A380974