[seqfan] Look-a-likes (A156769~A036279), (A160143~A009843)

Peter Luschny peter.luschny at googlemail.com
Mon May 4 20:54:06 CEST 2009

** Look-a-likes (A156769~A036279), (A160143~A009843) **

Possible-duplicates, near-duplicates and
look-alikes are members of a family.

The 'look-alikes' are the most interesting
members of this family for me. Because the
question is: /Why/ do they look alike?

Johannes W. Meijer gave the following example:
A156769 describes a 'look-a-like' with A036279
(expansion of tan(x)).

Yesterday I found a similar example:
A160143 describes a 'look-a-like' with A009843
(the coefficients of the series for x/cos(x)).

Cheers Peter

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