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Triangular numbers whose digit permutations yield no further triangular numbers.
3

%I #8 Aug 06 2021 07:06:20

%S 1,3,6,15,21,28,36,45,55,66,78,91,136,171,231,276,378,406,435,465,528,

%T 561,595,666,703,741,861,903,990,1081,1128,1176,1225,1275,1326,1431,

%U 1540,1596,1653,1711,1770,1953,2016,2211,2278,2346,2485,2556,2628,2775

%N Triangular numbers whose digit permutations yield no further triangular numbers.

%Y Cf. A000217, A069674, A077671, A095870.

%K nonn,base

%O 1,2

%A _Ray Chandler_, Jun 29 2004

%E Offset changed to 1 by _Jinyuan Wang_, Aug 06 2021