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A355649 a(1) = a(2) = 1; for n > 2, a(n) is the smallest positive number that has the same number of divisors as the sum a(n-2) + a(n-1). 3

%I #9 Jul 14 2022 09:53:31

%S 1,1,2,2,4,6,6,12,12,24,36,60,60,120,180,180,360,360,720,840,840,1680,

%T 2520,2520,5040,7560,10080,10080,20160,27720,27720,55440,83160,110880,

%U 110880,221760,332640,554400,554400,1108800,1441440,1441440,2882880,4324320,7207200,7207200,14414400,21621600

%N a(1) = a(2) = 1; for n > 2, a(n) is the smallest positive number that has the same number of divisors as the sum a(n-2) + a(n-1).

%e a(7) = 6 as a(5) + a(6) = 4 + 6 = 10 which has four divisors, and 6 is the smallest positive number that has four divisors.

%Y Cf. A355636, A000005, A351001, A352768, A352867, A352774.

%K nonn

%O 1,3

%A _Scott R. Shannon_, Jul 12 2022

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Last modified August 16 23:15 EDT 2024. Contains 375195 sequences. (Running on oeis4.)