27845

Appears in sequences

• Cubes written backwards.at n=37A004165
• Number of partitions of n with equal nonzero number of parts congruent to each of 1 and 2 (mod 4).at n=54A035549
• Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.at n=22A048131
• Semiprimes whose digit reversal is a nontrivial power.at n=40A108849
• Semiprimes (A001358) whose digit reversal is a cube.at n=5A115712
• a(n) = a(n-1) + (1+a(n-2))*a(n-3) for n>1, a(1) = 1, a(n) = 0 for n<1.at n=11A209286
• a(n) = (x(n)^2 + 1)/m(n), with m(n) = A002559(n) (Markoff numbers) and x(n)= A324601(n), for n >= 3. The Markoff uniqueness conjecture is assumed to be true.at n=34A309161
• a(1) = 27846; thereafter a(n+1) = a(n) # n, where # is an operation that cycles through division, addition, subtraction and multiplication.at n=3A327962
• Numbers k whose binary expansion is a substring of the binary expansion of binomial(k,2).at n=45A356537
• The smallest k >= 0 that can be represented as a linear combination of 1^3, 2^3, ..., n^3 with coefficients +-1 and that cannot be represented using 1^3, 2^3, ..., m^3 with 1<=m<n.at n=21A392126