A159190 Main diagonal of array mentioned in A113941.

6, 9, 1247, 1891, 29539

Offset: 1

Author

Jonathan Vos Post, Apr 05 2009

Keywords

• base
• easy
• nonn

Comments

Main diagonal of array of k-gonal numbers which are also brilliant numbers.

Examples

			The array begins:
=============================================
....|.n=1.|.n=2.|.n=3.|..n=4.|..n=5.|in OEIS.|
=============================================
k=3.|...6.|..10.|...15.|...21.|....253.|A113940
k=4.|...4.|...9.|...25.|...49.|....121.|A001248
k=5.|..35.|.247.|.1247.|..2501.|..4187.|A113941
k=6.|...6.|..15.|..703.|..1891.|..2701.|new
k=7.|.403.|.697.|.2059.|.25351.|.29539.|new
=============================================
		

Crossrefs

Cf. A001248, A078972, A113940, A113941.

Formula

A(k,n) = n-th brilliant number A078972 among (n+2)-gonal numbers.