Numbers k such that Sum_{j=0..3} (k + j)^2 is a triangular number.
A201633
Numbers k such that Sum_{j=0..3} (k + j)^2 is a triangular number.
Terms
- a(0) =11a(1) =28a(2) =424a(3) =1001a(4) =14453a(5) =34054a(6) =491026a(7) =1156883a(8) =16680479a(9) =39300016a(10) =566645308a(11) =1335043709a(12) =19249260041a(13) =45352186138a(14) =653908196134
External references
- oeis: A201633