Example 2.6. The eigenvalues of the symmetric Pascal matrix, S2,
are λ1 =
3 + √
5
2
and λ2 =
3 −
√
5
2
, where λ1λ2 = 1 gives a reciprocal
pair.
Example 2.7. For n odd, let n = 3. Then the eigenvalues of the symmetric
Pascal matrix, S3, are λ1 = 4+√
15, λ2 = 4−
√
15, and λ3 = 1.
We note that λ1λ2 = 1 gives a reciprocal pair and λ3 = 1 is a selfreciprocal.