Triangular number
label: 三角数 @ja
label: Triangeltal @sv
label: عدد مثلثي @ar
label: Numero triangolare @it
label: 三角形數 @zh
label: Triangula nombro @eo
label: Треугольное число @ru
label: Τρίγωνοι Αριθμοί @el
label: Nombre triangulaire @fr
label: Bilangan segitiga @in
label: Трикутне число @uk
label: Trojúhelníkové číslo @cs
label: Dreieckszahl @de
label: 삼각수 @ko
label: Número triangular @es
label: Liczba trójkątna @pl
label: Driehoeksgetal @nl
label: Nombre triangular @ca
urlname: TriangularNumber
subject: Category:Integer sequences
subject: Category:Factorial and binomial topics
subject: Category:Squares in number theory
subject: Category:Proof without words
subject: Category:Figurate numbers
subject: Category:Triangles
subject: Category:Simplex numbers
id: p/a013370
description: número formado por obxectos colocados en forma de triangulo @gl
description: número que puede recomponerse en la forma de un triángulo equilátero @es
description: nombre figuré @fr
description: numero rappresentabile in forma di triangolo @it
description: Zomm vun den Zuelen 1 bis n @lb
description: Summe aus den Zahlen von 1 bis n @de
description: sumy początkowych liczb naturalnych @pl
description: класс фигурных чисел @ru
description: figurate number
description: figurális szám @hu
wiki page external link: http://www.cut-the-knot.org/do_you_know/triSquare.shtml
wiki page external link: http://rhubbarb.wordpress.com/2009/04/23/hypertetrahedral-polytopic-roots/
wiki page external link: http://www.cut-the-knot.org/do_you_know/numbers.shtml%23square
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Category:Figurate_numbers
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/1_+_2_+_3_+_4_+_⋯
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Square_number
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Group_stage
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Computus
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Cube_(algebra)
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Perfect_number
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Geometric_progression
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Ramanujan_theta_function
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Empty_sum
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Doubly_triangular_number
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Theta_function
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Fermat_polygonal_number_theorem
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Wacław_Sierpiński
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/If_and_only_if
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Eureka_(word)
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Category:Triangles
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Depreciation
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Recurrence_relation
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Dicuil
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Modular_arithmetic
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Cut-the-knot
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Category:Factorial_and_binomial_topics
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Kazimierz_Szymiczek
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Integer_sequence
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Pythagoreans
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Limit_of_a_sequence
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Squared_triangular_number
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Multiplicative_inverse
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/4000_(number)
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Equilateral_triangle
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Binomial_coefficient
wiki page wiki link: https://dbpedia-live.demo.openlinksw.com/resource/Pronic_number