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.

A049620 a(n) = T(n,n), array T as in A049615.

Original entry on oeis.org

0, 0, 3, 6, 11, 14, 23, 26, 35, 42, 55, 58, 75, 78, 95, 110, 127, 130, 155, 158, 183, 202, 227, 230, 263, 274, 303, 322, 355, 358, 403, 406, 439, 466, 503, 526, 575, 578, 619, 650, 699, 702, 763, 766, 815, 858, 907, 910, 975, 990, 1051, 1090, 1147, 1150, 1223, 1254, 1319, 1362, 1423, 1426, 1515, 1518, 1583
Offset: 0

Views

Author

Clark Kimberling

Keywords

Links

Crossrefs

Cf. A049615, A049616, A049617, A049618, A049619, A049621, A049622, A049623.

Programs

  • Mathematica
    T[n_, k_]:= Length[Select[Flatten[Table[{x, y}, {x,0,n}, {y,0,k}], 1], GCD @@ # > 1 &]]; Table[T[n, n], {n,0,65}] (* G. C. Greubel, Dec 16 2019 *)

Extensions

Terms a(38) onward added by G. C. Greubel, Dec 16 2019

A049621 a(n) = T(n,n+1), array T as in A049615.

Original entry on oeis.org

0, 1, 4, 8, 12, 18, 24, 30, 38, 48, 56, 66, 76, 86, 102, 118, 128, 142, 156, 170, 192, 214, 228, 246, 268, 288, 312, 338, 356, 380, 404, 422, 452, 484, 514, 550, 576, 598, 634, 674, 700, 732, 764, 790, 836, 882, 908, 942, 982, 1020, 1070, 1118, 1148, 1186, 1238, 1286, 1340, 1392, 1424, 1470, 1516
Offset: 0

Views

Author

Clark Kimberling

Keywords

Links

Crossrefs

Cf. A049615, A049616, A049617, A049618, A049619, A049620, A049622, A049623.

Programs

  • Mathematica
    T[n_, k_]:= Length[Select[Flatten[Table[{x, y}, {x,0,n}, {y,0,k}], 1], GCD @@ # > 1 &]]; Table[T[n, n+1], {n,0,65}] (* G. C. Greubel, Dec 16 2019 *)

Extensions

Terms a(37) onward added by G. C. Greubel, Dec 16 2019

A049622 a(n) = T(n,n+2), array T as in A049615.

Original entry on oeis.org

1, 2, 6, 9, 16, 19, 28, 33, 44, 49, 64, 67, 84, 93, 110, 119, 140, 143, 168, 179, 204, 215, 244, 251, 282, 297, 328, 339, 378, 381, 420, 435, 470, 495, 538, 551, 596, 613, 658, 675, 730, 733, 788, 811, 860, 883, 940, 949, 1012, 1039, 1098, 1119, 1184, 1201, 1270, 1307, 1370, 1393, 1468, 1471, 1548, 1577
Offset: 0

Views

Author

Clark Kimberling

Keywords

Links

Crossrefs

Cf. A049615, A049616, A049617, A049618, A049619, A049620, A049621, A049623.

Programs

  • Mathematica
    T[n_, k_]:= Length[Select[Flatten[Table[{x, y}, {x,0,n}, {y,0,k}], 1], GCD @@ # > 1 &]]; Table[T[n, n+2], {n,0,65}] (* G. C. Greubel, Dec 16 2019 *)

Extensions

Terms a(37) onward added by G. C. Greubel, Dec 16 2019

A049623 a(n) = T(n,n+3), array T as in A049615.

Original entry on oeis.org

2, 3, 7, 12, 17, 22, 31, 38, 45, 56, 65, 74, 91, 100, 111, 130, 141, 154, 177, 190, 205, 230, 249, 264, 291, 312, 329, 360, 379, 396, 433, 452, 481, 518, 539, 570, 611, 636, 659, 704, 731, 756, 809, 834, 861, 914, 947, 978, 1031, 1066, 1099, 1154, 1199, 1232, 1291, 1336, 1371, 1436, 1469, 1502, 1575
Offset: 0

Views

Author

Clark Kimberling

Keywords

Links

Crossrefs

Cf. A049615, A049616, A049617, A049618, A049619, A049620, A049621, A049622.

Programs

  • Mathematica
    T[n_, k_]:= Length[Select[Flatten[Table[{x, y}, {x,0,n}, {y,0,k}], 1], GCD @@ # > 1 &]]; Table[T[n, n+3], {n,0,65}] (* G. C. Greubel, Dec 16 2019 *)

Extensions

Terms a(37) onward added by G. C. Greubel, Dec 16 2019
Showing 1-4 of 4 results.

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