OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
PROG
(PARI) { n=p=0; for (m=3, 10^9, if (isprime(eulerphi(m)/2), if (m==p + 1, write("b065976.txt", n++, " ", p); if (n==1000, return)); p=m) ) } \\ Harry J. Smith, Nov 05 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jason Earls, Dec 09 2001
STATUS
approved