This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A212016 Sums of the squares of two or more consecutive integers. 5
 1, 2, 5, 6, 10, 13, 14, 15, 19, 25, 28, 29, 30, 31, 35, 41, 44, 50, 54, 55, 56, 60, 61, 69, 77, 85, 86, 90, 91, 92, 96, 105, 110, 113, 121, 126, 135, 139, 140, 141, 145, 146, 149, 154, 170, 174, 181, 182, 190, 194, 195, 199, 203, 204, 205, 209, 218 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Subsequence of A062861. Contains A212015 as a subsequence. A174069 is a subsequence. - Altug Alkan, Dec 24 2015 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE N:= 1000: # to get all terms <=N g:= x -> x*(x+1)*(2*x+1)/6: S:= select(`<=`, {seq(seq(g(b)-g(a), a= -b-1 .. b-2), b = 1..floor((sqrt(2*N-1)+1)/2))}, N): sort(convert(S, list)); # Robert Israel, Jan 05 2016 PROG (PARI) { isA212016(t) = fordiv(6*t, k, if(k==1, next); z=(k^2-1)/3; if(issquare(4*t/k-z), return(k)); if(z>4*t/k, break); ); 0 } CROSSREFS Cf. A062861, A174069, A212015. Sequence in context: A187902 A187231 A162340 * A212015 A255341 A089269 Adjacent sequences:  A212013 A212014 A212015 * A212017 A212018 A212019 KEYWORD nonn,easy AUTHOR Max Alekseyev, Apr 26 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 23 22:38 EDT 2019. Contains 325278 sequences. (Running on oeis4.)