A117512 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A117512

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

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

Adjacent sequences: A117509 A117510 A117511 * A117513 A117514 A117515

KEYWORD

nonn,base

AUTHOR

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

STATUS

approved