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%I #21 Mar 01 2022 07:26:03
%S 1,2,17,21,336
%N Numbers k such that the k-th tetrahedral number k*(k+1)*(k+2)/6 is palindromic.
%C No more terms to 10^10. - _Charles R Greathouse IV_, Mar 23 2011
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/tetra.htm">Palindromic Tetrahedrals</a>
%t Select[Range[350],PalindromeQ[(#(#+1)(#+2))/6]&] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Apr 02 2018 *)
%Y Cf. A006030.
%K nonn,base,more
%O 1,2
%A _Patrick De Geest_
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