OFFSET
1,2
COMMENTS
From a question 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, 200}]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Jul 04 2000
STATUS
approved