OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..176
EXAMPLE
3 is a term since cototient(3) = 1 and cototient(1) + cototient(2) = 0 + 1 = 1.
105 is a term since cototient(105) = 57 and cototient(103) + cototient(104) = 1 + 56 = 57.
MATHEMATICA
cotot[n_] := n - EulerPhi[n]; Select[Range[3, 10^6], cotot[#] == cotot[# - 1] + cotot[# - 2] &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Mar 04 2020
STATUS
approved