A single integer N = a complete chess game

Hans Havermann pxp at rogers.com
Wed Apr 16 18:55:28 CEST 2008


> > terms: a(9), a(13), a(22) and a(23) in
> > http://www.research.att.com/~njas/sequences/A139074

> (23+1579!)/23 is probably prime

An interesting question ("is there a prime in A139069 = A137390 ?"),
but it does not justify a duplicate entry.
The %S and %K of A137390 should go into A139069 and the former suppressed.
Also, the fact that the xref to A139074 appears twice in A139072 does
not change the fact that the latter is potentially ill-defined, a
clause like "...or 0 if there is none" should be added IMHO
(and on that occasion (9+n!)/9 -> 1+ n!/9, maybe).
Maximilian

%I A137390
%S A137390 8,46,87,168,259,262,292,329,446,1053
%N A137390 a(n) = numbers k for which (9+k!)/9 is prime.
%K A137390 nonn,more,new
%O A137390 1,1
%A A137390 Artur Jasinski (grafix(AT)csl.pl), Apr 09 2008

%I A139069
%S A139069 8,46,87,168,259,262,292,329,446
%N A139069 a(n) = numbers k for which (9+k!)/9 is prime.
%C A139069 Primes of the form (9+k!)/9 see A139068
%t A139069 a = {}; Do[If[PrimeQ[(n! + 9)/9], AppendTo[a, n]], {n, 1, 500}]; a
%Y A139069 Cf. A082672, A089085, A089130, A117141, A007749, A139056,
A139057, A139058, A139059, A139060, A139061, A139061, A139062,
A139063, A139064, A139065, A139066,
               A139067, A139068, A139069, A139070, A139071, A139072.
%K A139069 nonn,new
%O A139069 1,1
%A A139069 Artur Jasinski (grafix(AT)csl.pl), Apr 07 2008





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