1,1
Main diagonal of array of k-gonal numbers which are also brilliant numbers.
Table of n, a(n) for n=1..5.
A(k,n) = n-th brilliant number A078972 among (n+2)-gonal numbers.
The array begins:
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....|.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
Cf. A001248, A078972, A113940, A113941.
Sequence in context: A264375 A061110 A110460 * A236766 A004075 A202951
Adjacent sequences: A159187 A159188 A159189 * A159191 A159192 A159193
base,easy,nonn
Jonathan Vos Post, Apr 05 2009
approved