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.

A336720 A336719 with duplicates removed.

Original entry on oeis.org

3, 7, 31, 127, 8191, 131071, 524287, 2147483647, 4432676798593, 2305843009213693951, 57912614113275649087721, 618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727, 79638304766856507377778616296087448490695649
Offset: 1

Views

Author

Jeppe Stig Nielsen, Aug 01 2020

Keywords

Comments

Also, record values in A005420.
Mersenne primes (A000668) are a subsequence.
For the corresponding orders of 2 (exponents), see A336721.

Crossrefs

Cf. A000668, A005420, A336719, A336721.

Programs

  • PARI
    re=0;for(k=2,+oo,p=vecmax(factor(2^k-1)[,1]);if(p>re,re=p;print1(re,", ")))

A336721 Values k where A336719(k) increases.

Original entry on oeis.org

2, 3, 5, 7, 13, 17, 19, 31, 49, 61, 83, 89, 107, 127, 167, 179, 197, 233, 241, 269, 281, 347, 373, 421, 443, 457, 487, 521, 607, 697, 769, 829, 881, 1049, 1063
Offset: 1

Views

Author

Jeppe Stig Nielsen, Aug 01 2020

Keywords

Comments

Also, values k (record positions) where A005420(k) reaches a new maximum. For the maximum itself, see A336720.
A000043 is a subsequence.

Crossrefs

Cf. A000043, A005420, A336719, A336720.

Programs

  • PARI
    re=0;for(k=2,+oo,p=vecmax(factor(2^k-1)[,1]);if(p>re,re=p;print1(k,", ")))
Showing 1-2 of 2 results.

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

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