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Search: id:A118016
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| A118016 |
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Integers of the form 2^n/(n-1). |
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+0
1
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| 4, 4, 8, 64, 8192, 268435456, 576460752303423488, 5316911983139663491615228241121378304, 904625697166532776746648320380374280103671755200316906558262375061821325312
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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Terms of this sequence are four times the numbers of De Bruijn's sequence: 2^(2^(n-1) - n) (A016031) a(n)=4*A016031 - Paolo P. Lava (ppl(AT)spl.at), Nov 10 2006
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EXAMPLE
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n=5 2^5/(5-1) = 32/4 = 8
n=17 2^17/(17-1) = 131072/16 = 8192
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MAPLE
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P:=proc(n) local i, j; for i from 2 by 1 to n do j:=2^i/(i-1); if trunc(j)=j then print(j); fi; od; end: P(5000);
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CROSSREFS
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Cf. A016031.
Sequence in context: A096252 A137717 A102369 this_sequence A071775 A134576 A143183
Adjacent sequences: A118013 A118014 A118015 this_sequence A118017 A118018 A118019
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KEYWORD
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nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 11 2006
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