cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A354220 a(n) is the record setting number of distinct prime factors in the product of the composite numbers between p = A354219(n) and the next prime after p.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 20, 25, 27, 37, 38, 39, 40, 41, 45, 49, 56, 64, 66, 89, 90, 114, 120, 131, 145, 154, 164, 174, 187, 207, 217, 218, 222, 225, 266, 302, 328, 329, 330, 351, 364, 369, 377, 381, 437, 447, 449, 454, 461, 468, 497, 530, 535, 548, 551
Offset: 1

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Author

Hugo Pfoertner, May 20 2022

Keywords

Crossrefs

Programs

  • Mathematica
    Union@ FoldList[Max, Array[PrimeNu[Times @@ FactorInteger[Times @@ Range[#1 + 1, #2 - 1]][[All, 1]]] & @@ Map[Prime, # + {0, 1}] &, 10^4]] (* Michael De Vlieger, May 20 2022 *)
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