OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
The sum of the first three primes = 10 and phi(10) = 4, so a(3) = 4.
MATHEMATICA
Table[EulerPhi[Sum[Prime[k], {k, 1, i}]], {i, 1, 100}]
EulerPhi[Accumulate[Prime[Range[60]]]] (* Harvey P. Dale, Jun 18 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Oct 16 2002
STATUS
approved