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Search: id:A080197
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| A080197 |
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13-smooth numbers: i.e. numbers whose prime divisors are all <= 13. |
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+0
12
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 35, 36, 39, 40, 42, 44, 45, 48, 49, 50, 52, 54, 55, 56, 60, 63, 64, 65, 66, 70, 72, 75, 77, 78, 80, 81, 84, 88, 90, 91, 96, 98, 99, 100, 104, 105, 108, 110, 112, 117, 120
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numbers of the form 2^r*3^s*5^t*7^u*11^v*13^w with r, s, t, u, v, w >= 0.
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EXAMPLE
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33 = 3*11 and 39 = 3*13 are terms but 34 = 2*17 is not.
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PROGRAM
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(PARI) test(n)= {m=n; forprime(p=2, 13, while(m%p==0, m=m/p)); return(m==1)} for(n=1, 200, if(test(n), print1(n", ")))
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CROSSREFS
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Cf. A000079, A080196. For p-smooth numbers with other values of p, see A003586, A051037, A002473, A051038, A080681, A080682, A080683.
Adjacent sequences: A080194 A080195 A080196 this_sequence A080198 A080199 A080200
Sequence in context: A023810 A102800 A072676 this_sequence A115847 A032966 A122937
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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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