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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A354725 Terms of A354724 whose number of divisors sets a new record.

Original entry on oeis.org

1, 3, 25, 39, 1075, 2875, 93025, 548125, 1716775, 60231365, 9509852725, 111429831875
Offset: 1

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Author

Amiram Eldar, Jun 04 2022

Keywords

Comments

The corresponding numbers of divisors are 1, 2, 3, 4, 6, 8, 9, 10, 12, 16, 18, 20, ...
a(13) > 1.5*10^11, if it exists.

Crossrefs

Cf. A000005, A000120, A354723, A354724.

Programs

  • Mathematica
    bw[n_] := DigitCount[n, 2, 1]; q[n_] := Module[{d = Divisors[n]}, Union[bw /@ d] == Range[Length[d]]]; seq = {}; dm = 0; Do[If[(d = DivisorSigma[0, n]) > dm && q[n], dm = d; AppendTo[seq, n]], {n, 1, 10^5, 2}]; seq
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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