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A015792
Numbers k such that phi(k) + 3 | sigma(k).
1
12, 126, 152, 216, 245, 392, 490, 63872, 259856, 16750592, 4294541312
OFFSET
1,1
COMMENTS
a(12) > 10^12. - Donovan Johnson, Feb 28 2012
MATHEMATICA
Select[Range[100000],
Divisible[DivisorSigma[1, #], EulerPhi[#] + 3] &] (* David Nacin, Feb 28 2012 *)
CROSSREFS
Sequence in context: A178626 A223322 A061114 * A343769 A348463 A159736
KEYWORD
nonn
EXTENSIONS
Offset corrected and a(8)-a(11) from Donovan Johnson, Feb 28 2012
STATUS
approved