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A169855 EKG sequence started at 12 instead of 2.

%I A169855 #13 Dec 02 2021 10:13:35
%S A169855 12,2,4,6,3,9,15,5,10,8,14,7,21,18,16,20,22,11,33,24,26,13,39,27,30,
%T A169855 25,35,28,32,34,17,51,36,38,19,57,42,40,44,46,23,69,45,48,50,52,54,56,
%U A169855 49,63,60,55,65,70,58,29,87,66,62,31,93,72,64,68,74,37,111,75,78,76,80,82,41
%N A169855 EKG sequence started at 12 instead of 2.
%C A169855 A generalization of A064413.
%H A169855 Peter Kagey, <a href="/A169855/b169855.txt">Table of n, a(n) for n = 1..10000</a>
%o A169855 (Python)
%o A169855 from math import gcd
%o A169855 def aupton(terms):
%o A169855     alst, aset = [12], {12}
%o A169855     for n in range(2, terms+1):
%o A169855         k = 2
%o A169855         while True:
%o A169855             while k in aset: k += 1
%o A169855             if gcd(alst[-1], k) != 1:
%o A169855                 alst.append(k); aset.add(k); break
%o A169855             k += 1
%o A169855     return alst
%o A169855 print(aupton(73)) # _Michael S. Branicky_, Dec 02 2021
%Y A169855 For other initial terms, see A064413, A169837, A169839, A169841, A169843,A169845, A169847, A169849, A169851, A169853.
%K A169855 nonn
%O A169855 1,1
%A A169855 _T. D. Noe_ and _N. J. A. Sloane_, Jun 02 2010