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.

Previous Showing 11-16 of 16 results.

A139255 Complement of toothpick sequence A139250.

Original entry on oeis.org

2, 4, 5, 6, 8, 9, 10, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72
Offset: 1

Views

Author

Omar E. Pol, May 11 2008, Jan 02 2009

Keywords

Links

Crossrefs

Cf. A139250, A139251, A139252, A139253, A139254.

A139559 Primes in A139252 (related to the toothpick structure).

Original entry on oeis.org

3, 5, 7, 11, 17, 19, 23, 31, 59, 61, 67, 71, 83, 103, 107, 127, 139, 233, 239, 311, 439, 883, 919, 971, 983, 1039, 1087, 1091, 1123, 1399, 1487, 1567, 1747, 1811, 1999, 2131, 2383, 2467, 2927, 3391, 3583, 3659, 3671, 3691
Offset: 1

Views

Author

Omar E. Pol, May 17 2008

Keywords

Links

Crossrefs

Cf. A139250, A139251, A139252, A139253, A139254.

Extensions

Terms after a(17) from Nathaniel Johnston, Mar 29 2011

A152999 Primes in toothpick sequence A152998.

Original entry on oeis.org

3, 5, 7, 11, 17, 23, 47, 61, 97, 103, 151, 173, 191, 211, 241, 347, 353, 359, 367, 397, 467, 541, 599, 607, 659, 733, 1109, 1237, 1367, 1439, 1453, 1471, 1663, 2029, 2357, 2399, 2671, 2797, 3373, 3607, 3719, 3911, 4241, 5479, 5501, 5527, 5701, 5741, 5779, 5923
Offset: 1

Views

Author

Omar E. Pol, Dec 23 2008

Keywords

Links

Crossrefs

Cf. A139250, A139251, A139253, A152768, A152968, A152978, A152998, A153000, A153002, A153006, A153009.

Extensions

More terms from Jinyuan Wang, Mar 15 2020

A161414 Primes in A161412.

Original entry on oeis.org

2, 3, 5, 19, 29
Offset: 1

Views

Author

Omar E. Pol, Jun 10 2009

Keywords

Crossrefs

Cf. A139253, A161412, A161423.

A153005 Primes in toothpick sequence A153003.

Original entry on oeis.org

7, 31, 127, 211, 487, 571, 643, 811, 1033, 1249, 1663, 1999, 2131, 2179, 2281, 2347, 2467, 3391, 4801, 5059, 6361, 7759, 8191, 8209, 8713, 8779, 8929, 9187, 9343, 9679, 9931, 10687, 13903, 14947, 19009, 19267, 19423, 25057, 26731, 28879, 33289, 35521
Offset: 1

Views

Author

Omar E. Pol, Jan 02 2009

Keywords

Links

Crossrefs

Cf. A139250, A139253, A152998, A152999, A153000, A153002, A153003, A153006, A153009.

Programs

  • Maple
    read("transforms3") ; a139250 := BFILETOLIST("b139250.txt") ; A139250 := proc(n) global a139250; op(n+1,a139250) ; end: A153003 := proc(n) if n =0 then 0; else 1+3/4*(A139250(n+1)-3) ; fi; end: for n from 0 to 400 do p := A153003(n) ; if isprime(p) then printf("%d,",p) ; fi; od: # R. J. Mathar, Jul 13 2009
  • Mathematica
    a139250 = Cases[Import["https://oeis.org/A139250/b139250.txt", "Table"], {, }][[All, 2]];
A139250[n_] := a139250[[n + 1]];
A153003[n_] := If[n == 0, 0, 1 + 3/4*(A139250[n + 1] - 3)];
Reap[Do[p = A153003[n]; If[PrimeQ[p], Sow[p]], {n, 0, 400}]][[2, 1]] (* Jean-François Alcover, Apr 05 2020 *)

Extensions

More terms from R. J. Mathar, Jul 13 2009

A161218 Primes in A161206.

Original entry on oeis.org

3, 7, 13, 31, 43, 211, 241, 317, 443, 499, 709, 1097, 1223, 1459, 1549, 1663, 1789
Offset: 1

Views

Author

Omar E. Pol, Jun 10 2009

Keywords

Crossrefs

Cf. A000040, A139253, A161206, A161414, A161423.

Extensions

More terms from Vincenzo Librandi, Jan 30 2011
Previous Showing 11-16 of 16 results.

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

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