Search: id:A117710
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%I A117710
%S A117710 0,1,5,51,70,210,330,590,715,1001,1080,1162,1520,1820,2035,2380,2501,
%T A117710 3015,3290,3725,4030,4510,5017,5370,6112,6305,6501,6700,6902,7107,7740,
%U A117710 8400,9087,9560,9801,10045,10292,10542,10795,11051,11310,11572,12105
%N A117710 Pentagonal numbers for which the product of the digits is also a pentagonal 
               number.
%e A117710 715 is in the sequence because it is a pentagonal number and the product 
               of its digits 7*1*5=35 is also a pentagonal number.
%Y A117710 Cf. A000326.
%Y A117710 Sequence in context: A106425 A160779 A077681 this_sequence A064019 A134938 
               A068540
%Y A117710 Adjacent sequences: A117707 A117708 A117709 this_sequence A117711 A117712 
               A117713
%K A117710 base,nonn
%O A117710 0,3
%A A117710 Luc Stevens (lms022(AT)yahoo.com), Apr 13 2006

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