000 00602nam a2200145 4500
999 _c13314
_d13314
008 190228b ||||| |||| 00| 0 eng d
022 _a0746-8342
082 _aDPer 510.5 C697 Jan 2012-Sept 2015 v. 43 & 46, n. 1-4
100 _aNelsen, Roger B.
_937219
245 _aProof without words:
_beach but two triangular numbers is a sum of three triangular numbers/
_cRoger B. Nelsen.
260 _aWashington D. C.:
_bMathematical Association of America,
_ccJul 2012-Sept 2015.
300 _av43 n3, page 172:
_bIllustrations;
_c25 cm.
650 _aMathematics
_xTriangular number.
_937220
942 _2ddc
_cPER