1,1

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

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.|

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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

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Cf. A001248, A078972, A113940, A113941.

Sequence in context: A053490 A061110 A110460 this_sequence A004075 A052193 A144763

Adjacent sequences: A159187 A159188 A159189 this_sequence A159191 A159192 A159193

base,easy,nonn

Jonathan Vos Post (jvospost3(AT)gmail.com), Apr 05 2009