Search: id:A027575
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%I A027575
%S A027575 14,30,54,86,126,174,230,294,366,446,534,630,734,846,966,1094,1230,
%T A027575 1374,1526,1686,1854,2030,2214,2406,2606,2814,3030,3254,3486,3726,
%U A027575 3974,4230,4494,4766,5046,5334,5630,5934,6246,6566,6894,7230,7574
%N A027575 n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2.
%C A027575 Summation of n^2 taken 4 at a time. [From Al Hakanson (hawkuu(AT)gmail.com), 
               May 20 2009]
%H A027575 P. De Geest, <a href="http://www.worldofnumbers.com/sumsquare.htm">Palindromic 
               Sums of Squares of Consecutive Integers</a>
%F A027575 4*n^2+20*n+30. Offset 0. a(3)=126. [From Al Hakanson (hawkuu(AT)gmail.com), 
               May 20 2009]
%F A027575 a(n)=8*n+a(n-1), (with a(1)=14) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Oct 24 2009]
%e A027575 For n=2, a(2)=8*2+14=30; n=3, a(3)=8*3+30=54; n=4, a(4)=8*4+54=86 [From 
               Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 24 2009]
%o A027575 sage: [i^2+(i+1)^2+(i+2)^2+(i+3)^2 for i in xrange(0,50)] - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Jul 03 2008
%Y A027575 Sequence in context: A132759 A011257 A083540 this_sequence A104776 A101960 
               A075208
%Y A027575 Adjacent sequences: A027572 A027573 A027574 this_sequence A027576 A027577 
               A027578
%K A027575 nonn
%O A027575 0,1
%A A027575 Patrick De Geest (pdg(AT)worldofnumbers.com)

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