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.

Showing 1-2 of 2 results.

A104089 Largest prime <= 4^n.

Original entry on oeis.org

3, 13, 61, 251, 1021, 4093, 16381, 65521, 262139, 1048573, 4194301, 16777213, 67108859, 268435399, 1073741789, 4294967291, 17179869143, 68719476731, 274877906899, 1099511627689, 4398046511093, 17592186044399, 70368744177643
Offset: 1

Views

Author

Cino Hilliard, Mar 03 2005

Keywords

Crossrefs

Cf. A014234, A104082, A104088, A104090-A104094, A003618, A104096.
Cf. A000040, A000302, A007917.

Programs

  • Mathematica
    NextPrime[4^Range[30], -1] (* Paolo Xausa, Oct 28 2024 *)
  • PARI
    g(n,b) = for(x=0,n,print1(precprime(b^x)","))

Formula

a(n) = A007917(A000302(n)). - Paolo Xausa, Oct 28 2024

A104090 Largest prime <= 5^n.

Original entry on oeis.org

5, 23, 113, 619, 3121, 15619, 78121, 390581, 1953109, 9765619, 48828113, 244140613, 1220703073, 6103515623, 30517578121, 152587890563, 762939453109, 3814697265523, 19073486328109, 95367431640599, 476837158203071, 2384185791015571, 11920928955078089
Offset: 1

Views

Author

Cino Hilliard, Mar 03 2005

Keywords

Crossrefs

Cf. A014234, A054321, A104088, A104089, A104091-A104094, A003618, A104096.
Cf. A000040, A000351, A007917.

Programs

  • Mathematica
    NextPrime[5^Range[30] + 1, -1] (* Paolo Xausa, Oct 29 2024 *)
  • PARI
    g(n,b) = for(x=0,n,print1(precprime(b^x)","))

Formula

a(n) = A007917(A000351(n)). - Paolo Xausa, Oct 29 2024
Showing 1-2 of 2 results.

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

Content is available under The OEIS End-User License Agreement.