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 1-5 of 5 results.

A169678 The second of a pair of sequences A and B with property that all the differences |a_i - b_j| are distinct - for precise definition see Comments lines in A169677.

Original entry on oeis.org

0, 3, 12, 26, 45, 72, 105, 149, 199, 255, 316, 392, 401, 502, 596, 733, 865, 891, 1086, 1119, 1311, 1330, 1646, 1773, 2011, 2324, 2371, 2554, 2692, 3055, 3258, 3820, 3960, 4063, 4606, 5126, 5515, 5535, 6228, 6233, 7134, 7515, 7861, 8619
Offset: 1

Views

Author

R. K. Guy and N. J. A. Sloane, Mar 27 2010

Keywords

Comments

Computed by Alois P. Heinz and Wouter Meeussen, Mar 27 2010

Links

Crossrefs

Cf. A169677, A169679, A169680, A169690-A169693.

A169680 Consider all the differences |a_i-b_j| between sequences A169677 and A169678; the present sequence gives the numbers that are not such differences.

Original entry on oeis.org

42, 93, 117, 118, 119, 121, 139, 144, 155, 160, 177, 186, 193, 211, 212, 215, 218, 222, 229, 231, 232, 238, 256, 258, 263, 264, 266, 270, 271, 279, 284, 286, 296, 303, 306, 310, 312, 314, 317, 330, 345, 346, 351, 353, 360, 364, 365, 368, 371, 372, 375, 376, 380, 384
Offset: 1

Views

Author

R. K. Guy and N. J. A. Sloane, Mar 27 2010

Keywords

A169679 A169677 union A169678.

Original entry on oeis.org

0, 1, 3, 7, 12, 18, 26, 35, 45, 59, 72, 88, 105, 125, 149, 178, 199, 233, 255, 285, 316, 344, 352, 392, 401, 442, 502, 557, 596, 675, 733, 796, 797, 865, 891, 957, 1011, 1086, 1119, 1220, 1311, 1330, 1411, 1564, 1579, 1646, 1773, 1888, 2011, 2120, 2152, 2324, 2371
Offset: 1

Views

Author

R. K. Guy and N. J. A. Sloane, Mar 27 2010

Keywords

A169690 Let S be the sequence Fibonacci(2n), n>0 (cf. A001906); sequence lists the differences S(j)-S(i) for i

Original entry on oeis.org

2, 5, 7, 13, 18, 20, 34, 47, 52, 54, 89, 123, 136, 141, 143, 233, 322, 356, 369, 374, 376, 610, 843, 932, 966, 979, 984, 986, 1597, 2207, 2440, 2529, 2563, 2576, 2581, 2583, 4181, 5778, 6388, 6621, 6710, 6744, 6757, 6762, 6764, 10946, 15127, 16724, 17334, 17567
Offset: 1

Views

Author

N. J. A. Sloane, Apr 14 2010

Keywords

Comments

The sequences S and T (see A169691) are a pair of sequences with the property that the differences between the terms of S are disjoint from the differences between the terms of T, thus answering a question posed by S. W. Golomb.

Crossrefs

Cf. A000045, A001906, A169691, A169692, A169693, A169694, A169677-A169680.

Programs

  • Mathematica
    nn=30;With[{fib2=Fibonacci[Range[2,nn,2]]},Union[Flatten[Table[ fib2[[n]]- Take[ fib2, n-1],{n,nn/2}]]]] (* Harvey P. Dale, Jun 18 2012 *)

A169691 Let T be the sequence Fibonacci(2n+1), n>=0 (cf. A001519); sequence lists the differences T(j)-T(i) for i

Original entry on oeis.org

1, 3, 4, 8, 11, 12, 21, 29, 32, 33, 55, 76, 84, 87, 88, 144, 199, 220, 228, 231, 232, 377, 521, 576, 597, 605, 608, 609, 987, 1364, 1508, 1563, 1584, 1592, 1595, 1596, 2584, 3571, 3948, 4092, 4147, 4168, 4176, 4179, 4180, 6765, 9349, 10336, 10713, 10857, 10912, 10933
Offset: 1

Views

Author

N. J. A. Sloane, Apr 14 2010

Keywords

Comments

See Comments in A169691.

Crossrefs

Cf. A000045, A001519, A169690, A169692, A169693, A169677-A169680.

Programs

  • Mathematica
    Module[{nn=31,fbs},fbs=Fibonacci[Range[1,nn,2]];Sort[Flatten[Table[ fbs[[n]]- Take[fbs,n-1],{n,nn/2}]]]] (* Harvey P. Dale, Aug 30 2015 *)
Showing 1-5 of 5 results.

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

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