Search: id:A115742
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%I A115742
%S A115742 6,15,28,55,78,105,120,190,496,780,903,946,1176,1225,1275,1540,1653,
%T A115742 1770,1830,1891,2080,3081,3403,3486,3570,3741,3916,4186,4753,5050,5356,
%U A115742 5671,6670,7021,7140,7381,7503,7626,8515,8911,9316,9591,9870
%N A115742 Triangular numbers whose digit reversal is a semiprime (A001358).
%e A115742 15=T(5) and 51=3*17 is semiprime.
%Y A115742 Cf. A001358, A115741.
%Y A115742 Sequence in context: A000384 A164000 A134978 this_sequence A026102 A144519 
               A066995
%Y A115742 Adjacent sequences: A115739 A115740 A115741 this_sequence A115743 A115744 
               A115745
%K A115742 nonn,base
%O A115742 1,1
%A A115742 Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006

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