Curious relation: (Where A121561(n) = 1) == A093515

[Ferenc Adorjan]

Dear Maximilian,

I fully agree with you. I have already tried your function and it is indeed
extremely efficient (and also elegant...). I am sorry not being such
a professional in PARI-ing.

I would be pleased, if you add your code to the sequences or if you wish, I
can also make the suggested corrections and adding your code (with crediting
to your name, of course).

Best regards

Ferenc
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