Search: id:A080196
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%I A080196
%S A080196 13,26,39,52,65,78,91,104,117,130,143,156,169,182,195,208,234,260,273,
%T A080196 286,312,325,338,351,364,390,416,429,455,468,507,520,546,572,585,624,
%U A080196 637,650,676,702,715,728,780,819,832,845,858,910,936,975,1001,1014,1040
%N A080196 13-smooth numbers which are not 11-smooth.
%C A080196 Numbers of the form 2^r*3^s*5^t*7^u*11^v*13^w with r, s, t, u, v >= 0, 
               w > 0.
%e A080196 78 = 2*3*13 is a term but 77 = 7*11 is not.
%o A080196 (PARI) {m=1040; z=[]; for(r=0,floor(log(m)/log(2)),a=2^r; for(s=0,floor(log(m/
               a)/log(3)),b=a*3^s; for(t=0, floor(log(m/b)/log(5)),c=b*5^t; for(u=0,
               floor(log(m/c)/log(7)),d=c*7^u; for(v=0,floor(log(m/d)/log(11)), 
               e=d*11^v; for(w=1,floor(log(m/e)/log(13)),z=concat(z,e*13^w))))))); 
               z=vecsort(z); for(i=1,length(z),print1(z[i],","))}
%Y A080196 Cf. A080197, A051038.
%Y A080196 Sequence in context: A044898 A048842 A008595 this_sequence A033025 A044838 
               A033010
%Y A080196 Adjacent sequences: A080193 A080194 A080195 this_sequence A080197 A080198 
               A080199
%K A080196 easy,nonn
%O A080196 1,1
%A A080196 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Feb 10 2003

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