OFFSET
1,1
COMMENTS
Perhaps the same as A058340, but need proof. - Ray Chandler, May 20 2008
The first member of this sequence not in A058340 is 295937. - Robert Israel, Aug 12 2016
LINKS
Robert Israel, Table of n, a(n) for n = 1..20000
MAPLE
filter:= n -> isprime(n) and numtheory:-invphi(numtheory:-phi(n))[2] = 2*n:
select(filter, [seq(i, i=2..1000)]); # Robert Israel, Aug 12 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, May 10 2008
EXTENSIONS
Corrected and extended by Ray Chandler, May 20 2008
STATUS
approved