OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Wikipedia, Totient numbers.
EXAMPLE
2 is a term since both 2 and 4 are totient numbers.
PROG
(PARI) for(k = 1, 150, if(istotient(2*k) && istotient(2*k+2), print1(2*k, ", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Amiram Eldar, Mar 05 2020
STATUS
approved