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Define a mapping for a reduced rational number p/q by f(p/q) = 1 followed by p zeros followed by a 1 followed by q zeros.

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1010, 10100, 101000, 1001000, 10100000, 100100000, 1000100000, 1010000000, 10010000000, 100010000000, 10000010000000, 10100000000, 1010000, 1000100000000, 100000100000000, 10000000100000000 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`(p,q) = 1, p = A066657(n) and q = A066658(n).` `This gives another proof that rational numbers are countable.`
	FORMULA	`a(n) = 10^(p+q+1)+ 10^q where p = A066657(n) and q = A066658(n)`
	CROSSREFS	`Cf. A066657, A066658.` `Sequence in context: A043640 A145808 A157010 this_sequence A055473 A035125 A115769` `Adjacent sequences: A076937 A076938 A076939 this_sequence A076941 A076942 A076943`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Oct 19 2002`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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