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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A342838 Indices m such that A342834(m) is not squarefree.

Original entry on oeis.org

21, 31, 32, 39, 42, 62, 67, 75, 82, 91, 93, 97, 104, 109, 121, 127, 135, 137, 139, 140, 145, 146
Offset: 1

Views

Author

Bernard Schott and Daniel Suteu, Apr 01 2021

Keywords

Comments

From the factorization of the initial terms of A342834, it may appear that A342834(n) is always squarefree, but this is false, and that present sequence lists the exceptions.

Crossrefs

Cf. A013929, A342834, A342835, A342836, A342837.

Programs

  • PARI
    f(n) = my(s=""); for (k=1, n, s = Str(s, precprime(10^k))); eval(s); \\ A342834
isok(m) = !issquarefree(f(m)); \\ Michel Marcus, Apr 01 2021
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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