A074630 - OEIS

%I #19 Jul 14 2020 10:47:24

%S 3,12,27,48,75,91,108,133,192,217,243,247,259,273,300,301,343,363,364,

%T 399,403,427,432,469,481,511,532,553,559,589,651,675,679,703,721,741,

%U 763,768,777,793,817,819,867,868,871,889,903,949,972,973,988,1027,1029

%N Numbers k such that sigma(k) == 4 mod 6.

%H Amiram Eldar, <a href="/A074630/b074630.txt">Table of n, a(n) for n = 1..10000</a>

%F Mod(A000203(n), 6) = 4.

%F {n: A084301(n) = 4}. - _R. J. Mathar_, May 19 2020

%e k=48 is a term because sigma(48) = 1+2+3+4+6+8+12+16+24+48 = 124 = 6*20 + 4. [corrected by _Harvey P. Dale_, Jan 17 2013]

%t Select[Range[1100],Mod[DivisorSigma[1,#],6]==4&] (* _Harvey P. Dale_, Jan 17 2013 *)

%Y Cf. A000203, A067051, A072862, A074384, A074627, A074628.

%K easy,nonn

%O 1,1

%A _Labos Elemer_, Aug 26 2002