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 1-4 of 4 results.

A248903 Numbers k such that A248891(k) = 3.

Original entry on oeis.org

9, 12, 15, 17, 18, 22, 27, 32, 34, 39, 69, 70, 71, 79, 128, 143, 172, 226, 241, 242, 248, 269, 322, 325, 403, 405, 406, 420, 745, 2057, 2272, 2606, 2607, 3339, 3340, 3562, 4116, 4117, 4446, 5985, 6834, 7116, 7117, 7490, 7669, 13386, 13388, 15148, 15149, 15150
Offset: 1

Views

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

Comments

Sequence A248894 gives terms a(n) such that a(n+1)=a(n)+1.

Links

Crossrefs

Cf. A001359, A248891, A248894, A248901, A248902.

Programs

  • PARI
    lista(nn) = {my(c=q=0, r, v=List([3, 5, 11, 17])); forprime(p=19, nn, if(p-2==q, listput(v,q); if((t=v[c++]^(1+1/c))>v[c+3] && tJinyuan Wang, Nov 28 2020

A248901 Numbers k such that A248891(k) = 1.

Original entry on oeis.org

1, 2, 3, 4, 5, 20, 29, 30, 2059, 5987, 7119, 20165, 151819, 14984624, 105181798
Offset: 1

Views

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

Comments

If k is in {1, 2, 3, 4, 29, ...} then both numbers k and k+1 are in the sequence.

Crossrefs

Cf. A001359, A248891, A248902, A248903.

Programs

  • PARI
    lista(nn) = {my(c=0, q=r=5, s=3, t); forprime(p=9, nn, if(p-2==q, if((t=s^(1+1/c++))>r && tJinyuan Wang, Nov 28 2020

Extensions

a(13)-a(15) from Jinyuan Wang, Nov 28 2020

A248902 Numbers k such that A248891(k) = 2.

Original entry on oeis.org

6, 7, 8, 10, 19, 21, 23, 24, 28, 33, 72, 80, 270, 271, 323, 404, 2058, 4118, 5986, 7118, 13387, 16041, 20164, 30024, 30025, 76955, 151818, 622213, 1012549, 2482211, 2482212, 6330859, 9988608, 14984623, 105181797, 180589455
Offset: 1

Views

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

Comments

If k is in {6, 7, 23, 270, 30024, 2482211, ...} then both numbers k and k+1 are in the sequence. It seems that this set has more members.

Crossrefs

Cf. A001359, A248891, A248901.

Extensions

a(27)-a(36) from Jinyuan Wang, Nov 28 2020

A248894 Numbers k such that both numbers k and k+1 are in the sequence A248903.

Original entry on oeis.org

17, 69, 70, 241, 405, 2606, 3339, 4116, 7116, 15148, 15149, 20162, 137633, 324410, 332504, 439298, 1012547, 1121608, 2482209, 5028662, 6330857, 7180864, 7180865, 9569168, 14452770, 17021632, 110229972, 110229973, 193329301
Offset: 1

Views

Author

Jahangeer Kholdi and Farideh Firoozbakht, Nov 22 2014

Keywords

Comments

If k is in the set {69, 15148, 7180864, 110229972, ...} then both numbers k and k+1 are in the sequence. This means that k, k+1 and k+2 are in the sequence A248903. It seems that there exist more such numbers k.

Crossrefs

Cf. A001359, A248891, A248903.

Extensions

a(13)-a(29) from Jinyuan Wang, Nov 28 2020
Showing 1-4 of 4 results.

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

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