login
A117512
Triangular numbers for which the sum of the digits is a prime number.
0
3, 21, 120, 210, 300, 496, 595, 946, 1378, 1891, 2278, 2485, 2926, 3655, 3916, 4186, 4465, 4753, 5356, 5671, 6328, 6670, 7381, 7750, 8128, 8515, 8911, 9316, 9730, 10011, 10585, 11476, 11935, 12880, 13366, 13861, 14365, 15931, 16471, 18145, 18721
OFFSET
1,1
EXAMPLE
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.
MATHEMATICA
With[{trnos=Accumulate[Range[200]]}, Select[trnos, PrimeQ[Total[IntegerDigits[#]]]&]] (* Harvey P. Dale, Feb 14 2011 *)
CROSSREFS
Cf. A000217.
Sequence in context: A046727 A084159 A283421 * A068127 A247247 A322185
KEYWORD
nonn,base
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), Apr 26 2006
STATUS
approved