login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117512 Triangular numbers for which the sum of the digits is a prime number. 0

%I

%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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 8 02:07 EST 2016. Contains 278902 sequences.