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Search: id:A080195
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| A080195 |
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11-smooth numbers which are not 7-smooth. |
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+0
3
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| 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 154, 165, 176, 198, 220, 231, 242, 264, 275, 297, 308, 330, 352, 363, 385, 396, 440, 462, 484, 495, 528, 539, 550, 594, 605, 616, 660, 693, 704, 726, 770, 792, 825, 847, 880, 891, 924, 968, 990, 1056, 1078, 1089
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Numbers of the form 2^r*3^s*5^t*7^u*11^v with r, s, t, u >= 0, v > 0.
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EXAMPLE
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33 = 3*11 is a term but 35 = 5*7 is not.
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PROGRAM
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(PARI) {m=1100; 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=1, floor(log(m/d)/log(11)), z=concat(z, d*11^v)))))); z=vecsort(z); for(i=1, length(z), print1(z[i], ", "))}
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CROSSREFS
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Cf. A051038, A002473.
Sequence in context: A059632 A008593 A135499 this_sequence A004920 A136613 A113585
Adjacent sequences: A080192 A080193 A080194 this_sequence A080196 A080197 A080198
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KEYWORD
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easy,nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Feb 10 2003
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