/ a n / = / [ ( a ± 1 ) n ≡ x mod 10 ] + n / {\displaystyle /a^{n}/=/[(a\pm 1)^{n}\equiv x\mod 10]+n/}
![{\displaystyle /a^{n}/=/[(a\pm 1)^{n}\equiv x\mod 10]+n/}](https://wikimedia.org/api/rest_v1/media/math/render/svg/74e7d1a250109115cd975a6009cb00e703f6d124)
