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%I #7 Mar 14 2021 07:00:11
%S 1,3,4,5,6,9,10,12,15,16,21,22,25,28,35,36,45,49,51,55,64,66,70,78,81,
%T 91,92,100,105,117,120,121,136,144,145,153,169,171,176,190,196,210,
%U 225,231,247,253,256,276,287,289,300,324,325,330,351,361,376,378,400
%N Positive numbers that are triangular, square or pentagonal.
%o (PARI) isok(m) = ispolygonal(m,3) || ispolygonal(m,4) || ispolygonal(m,5);
%Y Cf. A000290, A000217, A000326, A005214.
%Y Cf. A245646, A245647, A245648.
%K nonn
%O 1,2
%A _Michel Marcus_, Mar 13 2021
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