Question-100290

Question Number 100290 by Harasanemanabrandah last updated on 26/Jun/20

Commented by Rasheed.Sindhi last updated on 26/Jun/20

^{∙} I f n i s m u l t i p l e o f 3 t h e n 3^{n} + n^{3}

i s o b v i o u s l y c o m p o s i t e (3 ∣ 3^{n} + n^{3})

^{∙} I f n i s o d d t h e n 3^{n} + n^{3} i s c o m p o s i t e

(2 ∣ 3^{n} + n^{3})

H e n c e f o r n \in {3, 6, 9, \dots} \cup {1, 3, 5, \dots}

t h e g i v e n e x p r e s s i o n i s c o m p o s i t e .