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A110092 Smallest prime ending (through <*2+1> or <*2-1> separately) a complete Cunningham chain (of the first or the second kind) of length n. 0
17, 59, 73, 4079, 47, 2879, 1065601 (list; graph; refs; listen; history; text; internal format)



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).


Table of n, a(n) for n=1..7.

Chris Caldwell's Prime Glossary, Cunningham chains.


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.


Terms computed by Gilles Sadowski


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, A005603.

Sequence in context: A058319 A095089 A106922 * A141896 A104165 A031391

Adjacent sequences:  A110089 A110090 A110091 * A110093 A110094 A110095




Alexandre Wajnberg, Sep 04 2005



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Last modified January 21 13:55 EST 2020. Contains 331113 sequences. (Running on oeis4.)