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%I #5 Apr 30 2015 20:45:19
%S 1,2,3,5,7,11,4,6,9,13,17,19,23,25,29,8,15,21,31,35,14,37,41,43,47,27,
%T 49,16,12,10,33,53,59,39,61,67,22,20,18,45,65,71,73,79,83,24,51,55,26,
%U 85,77,89,97,32,57,91,101,95,28,69,103,107
%N 1 followed by the numbers successively added to the four arms of the spirals in A257329, A257330, A257331, A257332.
%C Conjectured to be a permutation of the natural numbers.
%H Popular Computing (Calabasas, CA), <a href="/A257321/a257321.png">Problem 146: Gcd</a>, Vol. 4 (No. 45, Dec 1976), page PC45-4.
%H N. J. A. Sloane, <a href="/A257321/a257321_1.png">Spirals showing initial terms of A257321-A257332</a>
%Y Cf. A257329, A257330, A257331, A257332.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Apr 30 2015
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