

A112674


Numbers of the form (2^(i*j)1)/((2^i1)*(2^j1)) where gcd(i,j) = 1.


0



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
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OFFSET

1,2


REFERENCES

C. L. Chen, R. T. Chien and C. K. Liu, On the binary representation form of certain integers, SIAM J. Appl. Math. 26 (1974), 283293.


LINKS

Table of n, a(n) for n=1..32.


MATHEMATICA

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 *)


CROSSREFS

Sequence in context: A178624 A027528 A192528 * A064086 A089579 A227638
Adjacent sequences: A112671 A112672 A112673 * A112675 A112676 A112677


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Dec 30 2005


EXTENSIONS

More terms from Robert G. Wilson v, Dec 31 2005


STATUS

approved



