%I A115428
%S A115428 1,4,20,31,14564,38239,69919,120395,426436,902596,7478020,9090220,
%T A115428 6671332084,8114264059,8482227259,9900250996,2244338786836,
%U A115428 2490577152964,2509440638591,2769448208395,7012067592220
%N A115428 Numbers n such that the concatenation of n with n+5 gives a square.
%C A115428 Also numbers n such that n concatenated with n+1 gives the product of 
               two numbers which differ by 4.
%C A115428 Also numbers n such that n concatenated with n+4 gives the product of 
               two numbers which differ by 2.
%e A115428 14564_14569 = 38163^2.
%Y A115428 Cf. A030465, A102567, A115426, A115437, A115429, A115430, A115431, A115432, 
               A115433, A115434, A115435, A115436, A115439.
%Y A115428 Cf. A116125, A116099, A116167, A116297, A116177, A116171, A116185, A116315.
%Y A115428 Sequence in context: A032425 A097251 A079454 this_sequence A043880 A030002 
               A085805
%Y A115428 Adjacent sequences: A115425 A115426 A115427 this_sequence A115429 A115430 
               A115431
%K A115428 nonn,base
%O A115428 1,2
%A A115428 Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
%E A115428 Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 13 2007