OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..15628
EXAMPLE
a(5) = 10 is the unique solution to Cototient(x) = A131825(5) = 6.
PROG
(PARI) lista(nn) = {my(c, r, v=vector(nn^2+2, i, i - eulerphi(i))); for(k=0, nn, c=0; for(i=1, k*k+2, if(k==v[i], r=i; c++)); if(c==1, print1(r, ", "))); } \\ Jinyuan Wang, Mar 22 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Franz Vrabec, Jul 20 2007
EXTENSIONS
More terms from Jinyuan Wang, Mar 22 2020
STATUS
approved