39939

Appears in sequences

• Base-9 palindromes that start with 6.at n=27A043033
• T(n,n-3), array T as in A054120.at n=21A054121
• Numbers such that harmonic mean of digits is 5.at n=24A062183
• Odd numbers n divisible by 3 such that for all k >= 1 the numbers n*2^k - 1 and n*2^(k+1) - 1 do not form a pair of primes.at n=5A243858
• Odd numbers n not congruent to 1 mod 6 and that are not perfect powers such that for all k >= 1 the numbers n*4^k - 1 are composite.at n=0A251757
• Numbers with digits 3 and 9 only.at n=43A284964
• Number of integer partitions of n without choosable initial intervals.at n=41A387118