Search: id:A076215
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%I A076215
%S A076215 1,5,77,92,70,195,143,3854,357,245,413,4088,2257,2222,652,679,278949,
%T A076215 3366,1281,67963,1612,8555,1518,63412,1159158,2619,2725,13862,60973,
%U A076215 3069,10790,3128,4620,5083,42918,3406
%N A076215 Square root of sum defined in A007475(n) and A001032(n).
%C A076215 6a(n)^2 is divisible by A001032(n). Proof: Let s = A007475(n), n = A001032(n), 
               then a(n)^2 = sum(k=s, s+n-1, k^2) = n/6*(2n^2+(6s-3)n+6s^2-6s+1).
%e A076215 A001032(3)=11, A007475(3)=18, so 18^2+19^2+...+28^2 (11 terms) = 77^2.
%Y A076215 Cf. A001032, A007475.
%Y A076215 Sequence in context: A136300 A144997 A088756 this_sequence A059856 A001513 
               A028556
%Y A076215 Adjacent sequences: A076212 A076213 A076214 this_sequence A076216 A076217 
               A076218
%K A076215 nonn
%O A076215 0,2
%A A076215 Ralf Stephan (ralf(AT)ark.in-berlin.de), Nov 03 2002

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