Numbers n such that concatenating n and the sum of factorials of the digits of n produces a triangular number.

A108241

Numbers n such that concatenating n and the sum of factorials of the digits of n produces a triangular number.

Terms

    a(0) =0a(1) =3a(2) =18a(3) =122a(4) =2111a(5) =12442a(6) =40850a(7) =113347a(8) =202343a(9) =233506a(10) =332600a(11) =435405a(12) =525544a(13) =546233a(14) =554161a(15) =716795a(16) =1000334a(17) =1016217a(18) =1142240a(19) =1244630a(20) =2240515a(21) =2414603a(22) =3103412a(23) =3203757a(24) =3400440a(25) =3413651a(26) =3424213a(27) =3461244a(28) =4430222a(29) =5226150

External references