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Triangular numbers whose digit permutations yield at least two further triangular numbers.
3

%I #10 Aug 06 2021 06:58:59

%S 120,210,1035,2080,4095,4560,4950,5460,9045,13530,15400,17020,17205,

%T 17578,19306,20100,20503,20706,23005,30135,30628,36046,37401,40186,

%U 43071,43660,46360,46971,50721,51040,52003,53301,60031,63190,66430

%N Triangular numbers whose digit permutations yield at least two further triangular numbers.

%e 120 yields 21 and 210; 210 yields 21 and 120.

%Y Cf. A000217, A077671, A095869, A095870.

%K nonn,base

%O 1,1

%A _Amarnath Murthy_, Apr 06 2002

%E Edited, corrected and extended by _Ray Chandler_, Jun 29 2004

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