OFFSET
1,1
COMMENTS
See A229461.
Idoneal numbers not of the form 7 or 15 times a square. - Hugo Pfoertner, Aug 13 2017
LINKS
Eike Hertel, Reguläre Dreieckspflasterungen konvexer Polygone, Jenaer Schriften zur Mathematik und Informatik Math/Inf/01/13, 2013 (Preprint).
Eike Hertel, Christian Richter, Tiling Convex Polygons with Congruent Equilateral Triangles, Discrete Comput Geom (2014) 51:753-759.
MathOverflow, Which natural numbers are a square minus a sum of two squares?. Answer by user "Lucia", 2014 Dec 5.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Suggested by Eike Hertel, Hugo Pfoertner, Sep 24 2013
STATUS
approved