1. J.M. Aldaz, A. Bravo, S. Gutiérrez, A. Ubis, A theorem of D. J. Newman on Euler’s $$\varphi $$ function and arithmetic progressions. Am. Math. Mon. 108, 364–367 (2001)
2. C. Bays, R.H. Hudson, A new bound for the smallest $$x$$ with $$\pi (x)>\text{ Li }(x)$$. Math. Comput. 69, 1285–1296 (2000)
3. Y. Bugeaud, F. Luca, M. Mignotte, S. Siksek, On Fibonacci numbers with few prime divisors. Proc. Jpn. Acad. Ser. A Math. Sci. 81, 17–20 (2005)
4. D.A. Goldston, S.W. Graham, J. Pintz, C.Y. Yildirim, Small gaps between almost primes, the parity problem, and some conjecture of Erdős on consecutive integers. Int. Math. Res. Not. 7, 1439–1450 (2011)
5. M. Jaidee, P. Pongsriiam, Arithmetic functions of Fibonacci and Lucas numbers. Fibonacci Q. 57(3), 246–254 (2019)