Numbers n such that n^2 + n(n+1)/2 is an oblong number (A002378).
A220755
Numbers n such that n^2 + n(n+1)/2 is an oblong number (A002378).
Terms
- a(0) =0a(1) =1a(2) =28a(3) =117a(4) =2760a(5) =11481a(6) =270468a(7) =1125037a(8) =26503120a(9) =110242161a(10) =2597035308a(11) =10802606757a(12) =254482957080
External references
- oeis: A220755