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 11-14 of 14 results.

A214893 Conway's subprime Fibonacci sequence starting with (18, 5).

Original entry on oeis.org

18, 5, 23, 14, 37, 17, 27, 22, 7, 29, 18, 47, 13, 30, 43, 73, 58, 131, 63, 97, 80, 59, 139, 99, 119, 109, 114, 223, 337, 280, 617, 299, 458, 757, 405, 581, 493, 537, 515, 526, 347, 291, 319, 305, 312, 617, 929
Offset: 1

Views

Author

Wouter Meeussen, Jul 29 2012

Keywords

Comments

Similar to the Fibonacci recursion starting with (18, 5), but each new nonprime term is divided by its least prime factor. Sequence enters a loop of length 56 after 26 terms on reaching (119, 109).

Links

Crossrefs

Cf. A000045, A020639, A175723, A214551, A014682, A214674, A214892-A214898.

Programs

  • Mathematica
    see A214674
nxt[{a_,b_}]:=Module[{c=a+b},{b,If[PrimeQ[c],c,c/FactorInteger[c][[1,1]]]}]; Transpose[NestList[nxt,{18,5},82]][[1]] (* Harvey P. Dale, Oct 19 2012 *)

A214894 Conway's subprime Fibonacci sequence starting with (10, 18).

Original entry on oeis.org

10, 18, 14, 16, 15, 31, 23, 27, 25, 26, 17, 43, 30, 73, 103, 88, 191, 93, 142, 47, 63, 55, 59, 57, 58, 23, 27
Offset: 1

Views

Author

Wouter Meeussen, Jul 29 2012

Keywords

Comments

Similar to the Fibonacci recursion starting with (10, 18), but each new nonprime term is divided by its least prime factor. Sequence enters a loop of length 19 after 8 terms on reaching (23, 27).

Links

Crossrefs

Cf. A000045, A020639, A175723, A214551, A014682, A214674, A214892-A214898.

Programs

A214895 Conway's subprime Fibonacci sequence starting with (23, 162).

Original entry on oeis.org

23, 162, 37, 199, 118, 317, 145, 231, 188, 419, 607, 513, 560, 37, 199
Offset: 1

Views

Author

Wouter Meeussen, Jul 29 2012

Keywords

Comments

Similar to the Fibonacci recursion starting with (23, 162), but each new nonprime term is divided by its least prime factor. Sequence enters a loop of length 11 after 4 terms on reaching (37, 199).

Links

Crossrefs

Cf. A000045, A020639, A175723, A214551, A014682, A214674, A214892-A214898.

Programs

A214896 Conway's subprime Fibonacci sequence starting with (382, 127).

Original entry on oeis.org

382, 127, 509, 318, 827, 229, 528, 757, 257, 507, 382, 127
Offset: 1

Views

Author

Wouter Meeussen, Jul 29 2012

Keywords

Comments

Similar to the Fibonacci recursion starting with (382, 127), but each new nonprime term is divided by its least prime factor. Sequence enters a loop of length 10 after 2 terms on reaching (382, 127).

Links

Crossrefs

Cf. A000045, A020639, A175723, A214551, A014682, A214674, A214892-A214898.

Programs

Previous Showing 11-14 of 14 results.

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

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