OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..210
Max Alekseyev, PARI/GP Scripts for Miscellaneous Math Problems (invphi.gp).
EXAMPLE
phi(x) = 4*1+2 has 4 solutions (x = 7,9,14,18), so 1 is in the sequence.
PROG
(PARI) is(k) = invphiNum(4*k+2) == 4; \\ Amiram Eldar, Nov 05 2024, using Max Alekseyev's invphi.gp
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
EXTENSIONS
a(33)-a(37) from Amiram Eldar, Nov 05 2024
STATUS
approved