OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..392
FORMULA
MATHEMATICA
Table[ EulerPhi[ DivisorSigma[1, 2^n - 1]], {n, 33}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jul 19 2004
EXTENSIONS
Edited and extended by Robert G. Wilson v, Jul 23 2004
a(33)-a(35) from Amiram Eldar, Jun 04 2024
STATUS
approved