OFFSET
1,1
COMMENTS
From a question posed by Leo Moser.
REFERENCES
Martin Gardner, "The Last Recreations," Chapter entitled "Strong Laws of Small Primes," Copernicus, Springer-Verlag, NY, 1997, page 199.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Leo Moser, Problem P42, Canadian Mathematical Bulletin, Vol. 5, No. 3 (1962), pp. 312-313.
MATHEMATICA
s=1; Do[ s=s+EulerPhi[ n ]; If[ !PrimeQ[ s ], Print[ n ] ], {n, 1, 100} ]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Jul 04 2000
EXTENSIONS
Offset corrected by Amiram Eldar, Mar 01 2020
STATUS
approved