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I looked up a really basic sequence (the number of abelian groups of order n, in fact), and I was surprised to find that it wasn there. How come?

April 26, 2017abelian BASIC fact groups looked sequence surprised

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I looked up a really basic sequence (the number of abelian groups of order n, in fact), and I was surprised to find that it wasn there. How come?

1 Answer

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You probably miscalculated one of the terms! It is there: A000688. After 35 years most of the basic sequences are in the database now. When this happens, please recheck your calculations before submitting the sequence. It is also possible that you have included an initial term that most people don’t include (perhaps starting a number-theoretic sequence at n=0 rather than n=1). Of course it is entirely possible that your sequence really isn’t in the database, in which case please submit it!