A071979 - OEIS

%I #3 Dec 05 2013 19:55:20

%S 1,3,7,11,18,25,43,51,67,81,104,119,152,167,199,227,258,277,330,351,

%T 400,437,484,509,578,609,667,709,772,803,914,947,1010,1065,1136,1187,

%U 1292,1331,1411,1477,1574,1619,1764,1809,1906,1989,2084,2135,2276,2333

%N Left diagonal of A071977.

%t a = {1}; k = 2; Do[i = 1; While[i < n + 1, If[ GCD[k, n] == 1, a = Append[a, k]; i++ ]; k++ ], {n, 2, 55}]; Table[ a[[n(n - 1)/2 + 1]], {n, 1, 55}]

%K nonn

%O 1,2

%A _Amarnath Murthy_, Jun 18 2002

%E Edited by _Robert G. Wilson v_, Jun 28 2002