OFFSET
0,2
COMMENTS
Pollack et al. conjectured that a(n) > 2 for n > 4.
LINKS
Paul Pollack, Carl Pomerance and Enrique Treviño, Sets of monotonicity for Euler's totient function, preprint. See M↑(n) and M2(n).
Paul Pollack, Carl Pomerance and Enrique Treviño, Sets of monotonicity for Euler's totient function, Ramanujan J. 30 (2013), no. 3, 379--398.
Terence Tao, Monotone non-decreasing sequences of the Euler totient function, arXiv:2309.02325 [math.NT], 2023.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Chai Wah Wu, Sep 17 2023
STATUS
approved