A049506 - OEIS

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A049506

a(1)=1, a(2)=5, a(n+1) = 2^EulerPhi(a(1)*a(2)*...*a(n)) - 3.

1, 5, 13, 281474976710653 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`All are of form 2^k-3 and are relatively prime.` `a(5)=2^253289845471600 =~ 10^76247841084046.2149737362 =~ 1.640490562E76247841084046`
	REFERENCES	`Posting to Mathematica discussion group mathgroup(AT)smc.vnet.net by Andrzej Kozlowski [ andrzej(AT)tuins.ac.jp ].`
	LINKS	`Table of n, a(n) for n=1..4.`
	CROSSREFS	`Sequence in context: A012173 A009143 A127317 * A069524 A144518 A051542` `Adjacent sequences: A049503 A049504 A049505 * A049507 A049508 A049509`
	KEYWORD	`nonn,easy`
	AUTHOR	`Harvey P. Dale`
	STATUS	`approved`

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Last modified June 19 02:31 EDT 2013. Contains 226386 sequences.