The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A175270 Numbers k such that the least number of squares that add up to k equals the least number of triangular numbers that add up to k. Equivalently, A002828(k) = A061336(k). 1
 0, 1, 2, 13, 14, 18, 19, 20, 29, 33, 34, 35, 36, 37, 44, 54, 58, 59, 61, 62, 65, 72, 73, 75, 77, 86, 90, 96, 97, 101, 106, 107, 118, 129, 130, 131, 134, 137, 138, 140, 146, 147, 148, 152, 155, 157, 158, 160, 161, 164, 166, 176, 179, 181, 184, 187, 193, 195, 200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 PROG (PARI) is2s(n)=my(f=factor(n>>valuation(n, 2))); for(i=1, #f~, if(bitand(f[i, 2], 1) && bitand(f[i, 1], 3)==3, return(0))); 1 is2t(n)=my(m9=n%9, f); if(m9==5 || m9==8, return(0)); is2s(4*n+1) is(n)=my(o2=valuation(n, 2), f); if(n==0, return(1)); if(bitand(o2, 1)==0 && bitand(n>>o2, 7)==7, return(0)); if(issquare(n), return(ispolygonal(n, 3))); if(ispolygonal(n, 3), return(0)); is2t(n)==is2s(n) \\ Charles R Greathouse IV, Mar 17 2022 CROSSREFS Cf. A000217, A000290, A002828, A061336. Sequence in context: A369411 A229908 A335972 * A320339 A075032 A032932 Adjacent sequences: A175267 A175268 A175269 * A175271 A175272 A175273 KEYWORD nonn,easy AUTHOR Ctibor O. Zizka, Mar 19 2010 EXTENSIONS Data corrected and extended by Mohammed Yaseen, Mar 17 2022 STATUS approved

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

Last modified May 29 11:28 EDT 2024. Contains 372940 sequences. (Running on oeis4.)