Search: id:A031150
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%I A031150
%S A031150 1,2,4,5,6,12,18,43,80,154,191,228,456,684,1633,3038,5848,7253,8658,
%T A031150 17316,25974,62011,115364,222070,275423,328776,657552,986328,
%U A031150 2354785,4380794,8432812,10458821,12484830,24969660,37454490
%N A031150 Appending a digit to n^2 gives another perfect square.
%C A031150 Square root of 'Squares from A023110 with last digit removed'.
%e A031150 5^2 = 25 and 16^2 = 256, so 5 is in the sequence. 115364^2 = 13308852496, 
               364813^2 = 133088524969
%p A031150 for i from 1 to 150000 do if (floor(sqrt(10 * i^2 + 9)) > floor(sqrt(10 
               * i^2))) then print(i) end if end do;
%Y A031150 Cf. A023110, A030686, A030687, A053784.
%Y A031150 Sequence in context: A113631 A101951 A006539 this_sequence A125775 A058637 
               A026473
%Y A031150 Adjacent sequences: A031147 A031148 A031149 this_sequence A031151 A031152 
               A031153
%K A031150 nonn,base
%O A031150 0,2
%A A031150 Patrick De Geest (pdg(AT)worldofnumbers.com)

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