20012

Appears in sequences

• Primes in ternary.at n=38A001363
• Lexicographically earliest strictly increasing base 3 autovarious sequence: a(n) = number of distinct a(k) mod 3^n (written in base 3).at n=23A037091
• In the list of divisors of n (in base 3), each digit 0-2 appears equally often.at n=6A045811
• Primes of form 4k+3 written in base 3.at n=20A072805
• Binary numbers with 2 replacing 1 in odd positions.at n=19A095914
• Imaginary part of the Gaussian multiperfect number associated with the real part A100884.at n=38A100885
• Triangular matrix T, read by rows, that satisfies: SHIFT_LEFT(column 0 of T^p) = p*(column p+2 of T), or [T^p](m,0) = p*T(p+m,p+2) for all m>=1 and p>=-2.at n=49A111536
• Numbers 3*n + 2 written in base 3.at n=55A190642
• Number of 0..n arrays x(0..5) of 6 elements with nondecreasing average value.at n=7A200766
• Not necessarily palindromic primes of which initial and terminal digits are identical, as written in base 3.at n=15A231278
• Number of length 5 1..(n+2) arrays with no leading partial sum equal to a prime.at n=8A254543
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 598", based on the 5-celled von Neumann neighborhood.at n=43A273151
• Total height of all (unlabeled) rooted identity trees with n vertices.at n=14A291559
• Number of even-length integer partitions of n with integer alternating product.at n=51A347704
• Expansion of e.g.f. ( Product_{k>0} 1/(1 - x^k/k) )^(1/(1-x)).at n=6A356408