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A084954
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Initial prime of a prime chain of length n under the iteration x->2x+3.
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10
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2, 2, 2, 2, 47, 47, 6047, 477727, 30596497, 3388516667, 340746580567, 1763093883977, 773521306107547, 1142275515892937
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OFFSET
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1,1
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COMMENTS
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This is a special case of prime chains generated by f(x) = cx + d.
Is it smallest initial prime of a prime chain of length n under the iteration x->2x+3, or not? At least up to 3388516667 it is the smallest one. - Zak Seidov, Dec 20 2013
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LINKS
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EXAMPLE
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a(3) = 2 since 2, 2*2+3=7 and 2*7+3=17 are primes.
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CROSSREFS
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Cf. A057330, A057331, A083388, A084955, A084956, A084957, A084958, A084959, A084960, A084961, A128509, A134701, A134702.
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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