Numbers k such that k-1 is a square and k+1 is a triangular number.
A305292
Numbers k such that k-1 is a square and k+1 is a triangular number.
Terms
- a(0) =2a(1) =5a(2) =65a(3) =170a(4) =2210a(5) =5777a(6) =75077a(7) =196250a(8) =2550410a(9) =6666725a(10) =86638865a(11) =226472402a(12) =2943171002a(13) =7693394945a(14) =99981175205a(15) =261348955730
External references
- oeis: A305292