OFFSET
1,1
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
MAPLE
for i from 1 to 500 do if isprime(i) then print(phi(i+1)); fi; od;
MATHEMATICA
EulerPhi[1 + Prime@ Range@ 71] (* _Michael De Vlieger_, Feb 17 2021 *)
PROG
(PARI) a(n) = eulerphi(prime(n)+1); \\ _Michel Marcus_, Feb 17 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
_N. J. A. Sloane_
EXTENSIONS
Offset 1 from _Michel Marcus_, Feb 17 2021
STATUS
approved