OFFSET
1,1
EXAMPLE
sigma(82) = 126 = 40 + 54 + 32 = phi(82) + phi(82-1) + phi(82-2), so 82 is a term of the sequence.
MATHEMATICA
Select[Range[3, 10^5], EulerPhi[ # ] + EulerPhi[ # - 1] + EulerPhi[ # - 2] == DivisorSigma[1, # ] &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Joseph L. Pe, Feb 19 2002
EXTENSIONS
a(14)-a(28) from Donovan Johnson, Feb 05 2010
a(29)-a(31) from Donovan Johnson, Feb 08 2012
STATUS
approved