Search: id:A046758
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%I A046758
%S A046758 1,2,3,5,7,10,11,13,14,15,16,17,19,21,23,25,27,29,31,32,35,37,41,43,
%T A046758 47,49,53,59,61,64,67,71,73,79,81,83,89,97,101,103,105,106,107,109,
%U A046758 111,112,113,115,118,119,121,122,123,127,129,131,133,134,135,137,139
%N A046758 Equidigital numbers.
%C A046758 Write n as product of primes raised to powers, let D(n) = A050252 = total 
               number of digits in product representation (number of digits in all 
               the primes plus number of digits in all the exponents that are greater 
               than 1) and l(n) = number of digits in n; sequence gives n such that 
               D(n)=l(n).
%H A046758 J. P. Delahaye, "Primes Hunters", <a href="http://www.pour-la-science.com/
               numeros/pls-258/logique.htm#int5">Economical and Prodigal Numbers 
               (Text in French)</a>
%H A046758 R. G. E. Pinch, <a href="http://www.chalcedon.demon.co.uk/publish.html#62">
               Economical numbers.</a>
%H A046758 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               EquidigitalNumber.html">Link to a section of The World of Mathematics.</
               a>
%e A046758 For n=125=5^3, l(n)=3 but D(n)=2.
%Y A046758 Cf. A046759, A046760, A050252, A073048.
%Y A046758 Sequence in context: A076387 A163975 A125975 this_sequence A121232 A122428 
               A087246
%Y A046758 Adjacent sequences: A046755 A046756 A046757 this_sequence A046759 A046760 
               A046761
%K A046758 nonn,base,easy
%O A046758 1,2
%A A046758 N. J. A. Sloane (njas(AT)research.att.com).
%E A046758 More terms from Eric Weisstein (eric(AT)weisstein.com)

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