OFFSET
1,1
COMMENTS
For each of the values in A002174, there are only a finite number of numbers k such that psi(k)=A002174(n). This sequence gives the largest such k. Sequence A002396 gives the least k. The number of such k is given in A143408. When A002174(n) is twice a Sophie Germain prime, then a(n) is particularly small.
LINKS
T. D. Noe, Table of n, a(n) for n=1..1000
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Aug 13 2008
STATUS
approved