OEIS — The On-Line Encyclopedia of Integer Sequences
An encyclopedia of integer sequences, with formulas, programs, comments, and cross-references.
Enter a few integers and OEIS can lead you to formulas, references, implementations, and related sequences. It is a lookup table that often turns into a reading list.
The comments and cross-references are often where I want to go next. They connect the sequence I looked up to mathematics I wasn’t looking for.
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Topics: math, reference, number-theory, public-knowledge, search
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