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A118912
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a(1) = 2; a(n) is greatest prime < a(n-1)^4.
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0
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OFFSET
| 1,1
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COMMENTS
| Exponent 4 analogue of A059785 a(n+1)=prevprime(a(n)^2), with exponent 3 being A118910 a(1) = 2; a(n) is greatest prime < a(n-1)^3.
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FORMULA
| a(1) = 2; a(n) is greatest prime < a(n-1)^4.
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EXAMPLE
| a(1) = 2, by definition.
a(2) = 13 = 2^4 - 3.
a(3) = 28559 = 13^4 - 2.
a(4) = 665230244078823349 = 28559^4 - 12.
a(5) = 195833931687186822327230545227550596864953022841534058316595001440791433 = 665230244078823349^4 - 168.
a(6) is too large to include.
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CROSSREFS
| Cf. A001358, A055496, A076656, A006992, A005384, A005385, A118908-A118913.
Sequence in context: A139519 A111016 A176947 * A135970 A027738 A196815
Adjacent sequences: A118909 A118910 A118911 * A118913 A118914 A118915
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KEYWORD
| easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), May 05 2006
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