A143040 - OEIS

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A143040

10^n-th number divisible by exactly two distinct primes.

24, 184, 2102, 26608, 322033, 3741154, 42314023, 470041447, 5153982388, 55956463466 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	REFERENCES	`J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 184, pp 57, Ellipses, Paris 2008.`
	FORMULA	`a(n)=A007774(10^n).`
	CROSSREFS	`Cf. A007774.` `Sequence in context: A052761 A073993 A052758 * A128960 A047057 A066406` `Adjacent sequences: A143037 A143038 A143039 * A143041 A143042 A143043`
	KEYWORD	`more,nonn`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 18 2008`
	EXTENSIONS	`a(8)-a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 26 2010`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.