50274

Appears in sequences

• Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.at n=14A074266
• Sixth column of (1,5)-Pascal triangle A096940.at n=17A096943
• a(1) = 1. a(n) = a(n-1) + a(m), where m is the largest term of the sequence {a(k)} which is less than n.at n=37A133488
• a(n) = n^2*(n^2 + 15)/4.at n=21A159833
• a(n) = (2*n^3 + 5*n^2 + 21*n)/2.at n=35A162266
• Larger member of primitive friendly pairs ordered by smallest maximal element.at n=32A233039
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 99", based on the 5-celled von Neumann neighborhood.at n=41A270158
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=36A348099