66666666667
domain: N
Appears in sequences
- Primes that when squared gives numbers with digits in nondecreasing order.at n=30A028865
- a(n)^2 is smallest square starting with a string of n 4's.at n=10A034984
- Smallest n-digit prime containing only the digits 6 and 7, or 0 if no such prime exists.at n=10A036948
- Smallest prime containing exactly n 6's.at n=10A037065
- Numbers k such that k^2 contains only digits {4,8,9}.at n=23A053966
- Smallest prime beginning with exactly n 6's.at n=10A065589
- Number of Fibonacci numbers A000045(k), k <= 10^n, which end in 4.at n=12A067275
- Duplicate of A067275.at n=12A073552
- Primes arising in A087605, or 0 if A087605(n) = 0.at n=9A087608
- Numbers n > 2 such that n divides the concatenation of n-2 and n-1.at n=13A088797
- Primes of the form identical digits followed by a 7.at n=27A090147
- Primes of the form 60*R_k + 7, where R_k is the repunit (A002275) of length k.at n=5A093170
- Primes of the form 1 + repdigit. Primes whose totient is a repdigit.at n=12A096505
- a(n) is the least prime following A002280[n] repdigits.at n=11A099660
- Near-repdigit primes with at least two 6's as the repeated digit.at n=6A105978
- Primes such that the outer 2 digits are n and n+1 and all inner digits are 6, where 0 < n < 9.at n=9A108823
- The n-digit prime with the largest number of 6's, the largest of these if there is more than 1. 0 if no such prime exists.at n=10A178004
- Smallest prime that does not divide at least one n-digit pandigital number.at n=5A228253
- Primes p such that p^2 is the concatenation of x and 2*x+1 for some x.at n=9A355970
- Primes p such that p*(p-1) consists of exactly two different decimal digits.at n=13A380984