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Search: id:A057692
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| A057692 |
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Smallest prime which produces exactly n+1 different primes after n applications of the A057628 transform. |
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+0
1
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OFFSET
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0,1
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COMMENT
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a(4) found by Carlos Rivera (crivera(AT)primepuzzles.net) and confirmed to be the smallest by Paul Jobling (Paul.Jobling(AT)WhiteCross.com)
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EXAMPLE
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31 becomes 3331, and both 31 and 3331 are primes. 641 becomes 66666644441 and then 66666666666666666666666666666666666644444444444444441 and all 3 are primes.
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CROSSREFS
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Cf. A057628.
Sequence in context: A071360 A108491 A088104 this_sequence A058244 A024235 A010789
Adjacent sequences: A057689 A057690 A057691 this_sequence A057693 A057694 A057695
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KEYWORD
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base,hard,nonn
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)bvunet.net), Oct 20 2000
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