57856

Appears in sequences

• Number of n-step spirals on hexagonal lattice.at n=23A006777
• Number of ordered factorizations with 2 levels of parentheses indexed by prime signatures.at n=25A050357
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors (excluding the proper divisor 1). Rearrangements which cause leading zeros are excluded.at n=22A086248
• Numbers that appear in A076078.at n=28A097210
• a(n) = the number of sets of distinct positive integers with a least common multiple of A025487(n), i.e., A076078(A025487(n)).at n=22A097211
• Numbers n such that A076078(m)=n for some m, excluding powers of 2.at n=12A097416
• a(n) = Sum_{k=0..n} 3^(k-1)*Fibonacci(k).at n=8A099013
• Number of partitions where no part is a multiple of 9.at n=44A104502
• Row sums of unsigned A128090.at n=15A128091
• Number of different fixed (possibly) disconnected polyominoes (of any area) bounded (not necessarily tightly) by an n*n square.at n=3A162677
• Number of binary strings of length n with equal numbers of 00001 and 10000 substrings.at n=16A164203
• Numbers of the form p^9*q where p and q are distinct primes.at n=29A179692
• G.f.: Sum_{n>=0} n! * (1+n*x)^n * x^n / Product_{k=1..n} (1 + k*x + n*k*x^2).at n=8A185310
• E.g.f.: Product_{n>=1} (exp(2*x^n) + 1)/2.at n=7A203716
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 801", based on the 5-celled von Neumann neighborhood.at n=38A273575
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 374", based on the 5-celled von Neumann neighborhood.at n=18A287909
• Number of ways to write n as an ordered sum of 8 nonprime numbers.at n=30A341485
• Numbers k such that the smallest m such that k | psi(m) is even, psi = A002322.at n=9A341886