OFFSET
1,1
COMMENTS
REFERENCES
R. K. Guy, Unsolved Problems Number Theory, Sect. B36
EXAMPLE
phi(13+26)=24=2*phi(13), so a(13) is 26.
MATHEMATICA
Table[k=1; While[EulerPhi[n+k] != 2*EulerPhi[k], k++ ]; k, {n, 100}] (Noe)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jud McCranie, Dec 24 1999
STATUS
approved