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Search: id:A081395
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| A081395 |
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a(n)=x is the smallest value such that number of non-unitary prime divisors of a(n)-th Catalan number, A000108(x)=C(2x,x)/(x+1) equals n. |
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+0
3
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| 1, 6, 13, 25, 72, 96, 182, 320, 481, 923, 1018
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OFFSET
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0,2
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FORMULA
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a(n)=Min{x; A081389(x)=n}
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EXAMPLE
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n=6: a(6)=182, C(364,182)/183 has 6 non-unitary prime divisors: {2,3,7,11,17,19} and 182 is the smallest.
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CROSSREFS
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Cf. A000108, A081389, A081393, A081394.
Sequence in context: A101736 A162432 A117072 this_sequence A086224 A116913 A016071
Adjacent sequences: A081392 A081393 A081394 this_sequence A081396 A081397 A081398
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Mar 27 2003
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