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Search: id:A049506
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| A049506 |
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a(1)=1, a(2)=5, a(n+1) = 2^EulerPhi(a(1)*a(2)*...*a(n)) - 3. |
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+0
1
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OFFSET
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1,2
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COMMENT
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All are of form 2^k-3 and are relatively prime.
a(5)=2^253289845471600 =~ 10^76247841084046.2149737362 =~ 1.640490562E76247841084046
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REFERENCES
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Posting to Mathematica discussion group mathgroup(AT)smc.vnet.net by Andrzej Kozlowski [ andrzej(AT)tuins.ac.jp ].
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CROSSREFS
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Sequence in context: A009143 A127317 A139079 this_sequence A069524 A051542 A083660
Adjacent sequences: A049503 A049504 A049505 this_sequence A049507 A049508 A049509
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KEYWORD
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nonn,easy,bref
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AUTHOR
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Harvey P. Dale (hpd(AT)apscompany.com)
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