26691

Appears in sequences

• Number of n-step mappings with 4 inputs.at n=21A005945
• a(n) = (2*n+1)*(3*n+1)*(4*n+1).at n=10A033591
• a(n) = a(n-1) + 2*a(floor(n/2)) if n > 0, otherwise 1.at n=33A058039
• Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n is neither a prime, nor a true power of prime and n is squarefree. Squarefree solutions of A071140.at n=28A071141
• Numbers n such that (i) the sum of the distinct primes dividing n is divisible by the largest prime dividing n and (ii) n has exactly 4 distinct prime factors and (iii) n is squarefree.at n=10A071143
• Squarefree numbers k such that the largest prime factor of k is equal to the sum of the other prime factors of k.at n=27A071312
• Solutions to A096509[x]=6; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 6.at n=27A096517
• Numbers in base 10 that are palindromic in bases 5 and 6.at n=11A097930
• Numbers n such that the sum of the distinct prime divisors of n that are congruent to 1 mod 4 equals the sum of the distinct prime divisors congruent to 3 mod 4.at n=13A215949
• Number of distinct subsemigroups of the multiplicative semigroup of integers modulo n.at n=53A272213
• Odd squarefree numbers n > 1 such that lambda(n)^2 = phi(n), where lambda is the Carmichael lambda function and phi is Euler's totient function.at n=23A276980
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 389", based on the 5-celled von Neumann neighborhood.at n=28A281676
• Numbers that are nontrivially palindromic in two or more consecutive integer bases with non-constant number of digits .at n=8A327810
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UH, HH and HD.at n=18A329700
• Numbers k such that omega(k) = 4 and the largest prime factor of k equals the sum of its remaining distinct prime factors, where omega(k) = A001221(k).at n=13A383728
• Number of 2-colorings of an 4 X 4 X 4 grid, up to rotational symmetry, by the number of black cells.at n=4A386554