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Search: id:A110092
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| A110092 |
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Smallest prime ending (through <*2+1> or <*2-1> separately) a complete Cunningham chain (of the first or the second kind) of length n. |
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1
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OFFSET
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1,1
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COMMENT
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The word "complete" indicates each chain is exactly n primes long for the operator in function (i.e. the chain cannot be a subchain of another one); and the first and/or last term may not be involved in a chain of the other kind (i.e. the chain may not be connected to another one).
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LINKS
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Chris Caldwell's Prime Glossary, Cunningham chains.
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EXAMPLE
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a(1)=17 because 2, 3, 5, 7, 11 and 13 are part of longer chains whatever the operator; 17 is the first completely isolated prime.
a(2)=59 because it ends the first two primes chain not connected to another one: 29->59.
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MAPLE
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Terms computed by Gilles Sadowski
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CROSSREFS
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Cf. A023272, A023302, A023330, A005384, A005385, A059452, A059455, A007700, Cf. A059759, A059760, A059761, A059762, A059763, A059764, A059765, A038397, A104349, A091314, A069362, A016093, A014937, A057326, A110059, A110056, A110038, A059766, A110027, A059764, A110025, A110024, A059763, A110022, A109998, A109946, A109927, A109835, A109828.
Sequence in context: A058319 A095089 A106922 this_sequence A141896 A104165 A031391
Adjacent sequences: A110089 A110090 A110091 this_sequence A110093 A110094 A110095
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Sep 04 2005
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