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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A070524 Value of n-th cyclotomic polynomial at phi(n).

Original entry on oeis.org

0, 2, 7, 5, 341, 3, 55987, 257, 46873, 205, 11111111111, 241, 9726655034461, 39991, 14709241, 16777217, 19676527011956855057, 46441, 41660902667961039785743, 16519105, 8177824843189, 9090909091, 357686347714896679177439424707
Offset: 1

Views

Author

Labos Elemer, May 02 2002

Keywords

Examples

			n=6: the 6th cyclotomic polynomial is 1 - x + xx, phi(6)=2, C(6, phi(6)) = C(6,2) = 1 - 2 + 4 = 3 = a(6).

Crossrefs

Cf. A070518-A070523.

Programs

  • Mathematica
    Table[Cyclotomic[w, EulerPhi[w]], {w, 1, 25}]

A070530 Primes of form Cyclotomic[n,2^n].

Original entry on oeis.org

5, 73, 257, 4432676798593
Offset: 1

Views

Author

Labos Elemer, May 02 2002

Keywords

Examples

			4th term is Cyclotomic[7,128]=1+128+16384+2097152+..+4398046511104=4432676798593; the next 2 known terms have almost 200 or more than 1000 decimal digits.

Crossrefs

Cf. A070518-A070527.

Programs

  • Mathematica
    Do[s=Cyclotomic[n, 2^n]; If[PrimeQ[s], Print[s]], {n, 1, 59}]
Previous Showing 11-12 of 12 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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