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A175720 a(1) = 1, for n >= 2, a(n) = the smallest number m with (a(n-1) + 4) divisors. 2

%I

%S 1,16,240,17293822569102704640

%N a(1) = 1, for n >= 2, a(n) = the smallest number m with (a(n-1) + 4) divisors.

%F A000005(a(n)) = a(n-1) + 4 for n >= 2.

%e a(3) = 240 = the smallest number with 16 + 4 = 20 divisors.

%Y Cf. A014221, A175718, A175719.

%K nonn

%O 1,2

%A _Jaroslav Krizek_, Aug 15 2010

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Last modified August 1 01:56 EDT 2021. Contains 346377 sequences. (Running on oeis4.)