Search: id:A132425
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%I A132425
%S A132425 1,2,4,8,14,21,24,32,42,51,63,77,88,104,117,132,150,155,175,196,218,242,
%T A132425 268,296,326,358,392,427,469,518,554,592,629,646,665,690,713,744,771,
%U A132425 804,843,888,928,957,1001,1053,1101,1152,1198,1248,1302,1358,1416,1473
%N A132425 a(1)=1. a(2)=2. For n >= 3, a(n) is the smallest integer which is > a(n-1), 
               is not coprime to a(n-1) and is such that a(n)-a(n-1) does not equal 
               a(m)-a(m-1) for any m < n.
%C A132425 Is {a(n+1)-a(n)} a permutation of the positive integers?
%H A132425 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%t A132425 a = {1, 2}; For[n = 1, n < 1500, n++, n = a[[ -1]]; c = 0; While[c == 
               0, n++; If[GCD[n, a[[ -1]]] > 1, b = 0; For[j = 1, j < Length[a], 
               j++, If[a[[j + 1]] - a[[j]] == n - a[[ -1]], b = 1]]; If[b == 0, 
               AppendTo[a, n]; c = 1]]]]; a - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), 
               Oct 21 2007
%Y A132425 Cf. A089781, A132426.
%Y A132425 Sequence in context: A002132 A140164 A160730 this_sequence A154264 A155506 
               A014206
%Y A132425 Adjacent sequences: A132422 A132423 A132424 this_sequence A132426 A132427 
               A132428
%K A132425 nonn
%O A132425 1,2
%A A132425 Leroy Quet Aug 20 2007
%E A132425 More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), 
               Oct 21 2007

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