A345988 Smallest oblong number m*(m+1) that is divisible by n.

2, 2, 6, 12, 20, 6, 42, 56, 72, 20, 110, 12, 156, 42, 30, 240, 272, 72, 342, 20, 42, 110, 506, 72, 600, 156, 702, 56, 812, 30, 930, 992, 132, 272, 210, 72, 1332, 342, 156, 240, 1640, 42, 1806, 132, 90, 506, 2162, 240, 2352, 600, 306, 156, 2756, 702, 110, 56, 342, 812, 3422, 240

Offset: 1

Author

N. J. A. Sloane, Jul 13 2021

Keywords

• nonn

Comments

Equals A344005(n)*(A344005(n)+1). See A344005 for much more about this problem.

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A002378, A344005.

Programs

Mathematica

Module[{nn=60,ob},ob=Table[m(m+1),{m,nn}];Table[SelectFirst[ob,Mod[#,n]==0&],{n,nn}]] (* Harvey P. Dale, Jul 10 2024 *)