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A087700 a(1) = 1, a(n) = smallest number such that the n-th partial concatenation has n divisors. 1

%I #4 Dec 05 2013 19:56:32

%S 1,1,449,1,61206166658506517441,359

%N a(1) = 1, a(n) = smallest number such that the n-th partial concatenation has n divisors.

%C Next term is about 6.4*10^150 and is too large to include. - _David Wasserman_, Jun 16 2005

%e 1,11,11449,114491, etc. have 1, 2, 3 and 4 divisors respectively.

%e 11449= 107^2, 114491 = 13*8807.

%K base,easy,nonn

%O 1,3

%A _Amarnath Murthy_, Sep 26 2003

%E One more term from _David Wasserman_, Jun 16 2005

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Last modified August 24 02:14 EDT 2024. Contains 375396 sequences. (Running on oeis4.)