A202273 - OEIS

%I #8 Feb 25 2013 21:34:03

%S 1,2,5,8,14,15,20,23,24,26,30,38,40,41,45,46,51,54,55,56,58,59,60,71,

%T 74,78,87,88,89,90,92,95,106,113,118,123,136,137,143,145,146,153,167,

%U 173,178,179,215,233,263,269,303,317,335,353

%N Positive integers m in increasing order determined by these rules: a(1) = 1, for n>=1,  if m is in the sequence then also are numbers h such that sigma(h) = 3m.

%C Sequence is finite with 54 terms.

%e m=1, 3m=3, sigma(h)=3 for h=2; number 2 is in sequence.

%e m=2, 3m=6, sigma(h)=6 for h=5; number 5 is in sequence.

%e m=5, 3m=15, sigma(h)=15 for h=8; number 8 is in sequence.

%e m=8, 3m=24, sigma(h)=24 for h=14,15,23; numbers 14,15,23 are in sequence.

%Y Cf. A000203, A002191, A202274.

%K nonn,fini,full

%O 1,2

%A _Jaroslav Krizek_, Dec 25 2011