A076374 - OEIS

%I #13 Apr 25 2016 06:00:09

%S 2,10,6,12,9888,90,672,37680,3422877696,159840,35640,2977920,61724520,

%T 9530611200,272065167360,613958400

%N Smallest solution to x+n*phi(x) = sigma(x) = x+n*A000010(x) = A000203(x).

%C See comment to A076373.

%C a(17) > 10^12. a(18) > 10^12. a(19) = 353928960. - _Donovan Johnson_, Feb 29 2012

%C a(17) > 10^13. a(18) > 10^13. - _Giovanni Resta_, Apr 24 2016

%e n=3:solution set = {6,89152,..?}; n=7:solution-set = {672,146412,179864,..?}

%Y Cf. A000010, A000203, A076373.

%K nonn

%O 1,1

%A _Labos Elemer_, Oct 15 2002

%E a(8) corrected and a(9), a(12)-a(16) from _Donovan Johnson_, Feb 29 2012