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Search: id:A112674
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| A112674 |
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Numbers of the form (2^(i*j)-1)/((2^i-1)*(2^j-1)) where gcd(i,j) = 1. |
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+0
1
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| 1, 3, 11, 39, 43, 151, 171, 683, 2255, 2359, 2731, 9399, 10923, 43691, 140911, 149943, 174763, 549791, 599479, 699051, 2796203, 8727391, 8965359, 9588151, 11184811, 38350263, 44739243, 139090655, 178956971, 549687103, 572942063, 613576119
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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C. L. Chen, R. T. Chien and C. K. Liu, On the binary representation form of certain integers, SIAM J. Appl. Math. 26 (1974), 283-293.
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MATHEMATICA
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t = {1}; Do[a = (2^(i*j) - 1)/((2^i - 1)*(2^j - 1)); If[ GCD[i, j] == 1 && 1 < a < 10^9, AppendTo[t, a]], {i, 31}, {j, i - 1}]; Sort@t (* Robert G. Wilson v *)
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CROSSREFS
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Sequence in context: A151468 A018961 A027528 this_sequence A064086 A089579 A166336
Adjacent sequences: A112671 A112672 A112673 this_sequence A112675 A112676 A112677
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 30 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Dec 31 2005
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