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A117512 Triangular numbers for which the sum of the digits is a prime number. 0


%S 3,21,120,210,300,496,595,946,1378,1891,2278,2485,2926,3655,3916,4186,

%T 4465,4753,5356,5671,6328,6670,7381,7750,8128,8515,8911,9316,9730,

%U 10011,10585,11476,11935,12880,13366,13861,14365,15931,16471,18145,18721

%N Triangular numbers for which the sum of the digits is a prime number.

%e 595 is in the sequence because (1) it is a triangular number and (2) the sum of its digits 5+9+5=19 is a prime number.

%t With[{trnos=Accumulate[Range[200]]},Select[trnos,PrimeQ[Total[IntegerDigits[#]]]&]] (* _Harvey P. Dale_, Feb 14 2011 *)

%Y Cf. A000217.

%K nonn,base

%O 1,1

%A Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006

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Last modified December 18 20:17 EST 2014. Contains 252174 sequences.