OFFSET
1,3
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..1000
PROG
(PARI) H(n)=eulerphi(n)/2;
j=[]; for(n=2, 200, if(isprime(n), n+1, j=concat(j, H(n) ))); j
(PARI) { n=0; for (m=2, 10^9, if (!isprime(m), write("b062948.txt", n++, " ", eulerphi(m)/2); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 14 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jason Earls, Jul 21 2001
EXTENSIONS
Offset changed from 2 to 1 by Harry J. Smith, Aug 14 2009
STATUS
approved