OFFSET
1,2
COMMENTS
Conjecture: 4 and 9 are the only composite terms.
No more composite terms below 1.5e18. Such a term would require a prime gap greater than sqrt(p); in the absence of such large gaps, a(n) = prime(n-2) for n > 6. - Charles R Greathouse IV, Apr 12 2010
EXAMPLE
4 is a term as phi(4)=2 and phi(1), phi(2), phi(3) are <= 2. 16 is not a term as phi(16) < phi(11).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Amarnath Murthy, Jan 09 2002
EXTENSIONS
Offset changed by Andrew Howroyd, Sep 17 2024
STATUS
approved