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.

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A039015 Numbers whose base-5 representation has the same number of 3's and 4's.

Original entry on oeis.org

0, 1, 2, 5, 6, 7, 10, 11, 12, 19, 23, 25, 26, 27, 30, 31, 32, 35, 36, 37, 44, 48, 50, 51, 52, 55, 56, 57, 60, 61, 62, 69, 73, 79, 84, 89, 95, 96, 97, 103, 108, 113, 115, 116, 117, 125, 126, 127, 130, 131, 132, 135, 136, 137, 144, 148, 150, 151, 152, 155, 156, 157
Offset: 1

Views

Author

Olivier Gérard

Keywords

Links

Crossrefs

Cf. A007091.

Programs

  • Mathematica
    Select[Range[0,200],DigitCount[#,5,3]==DigitCount[#,5,4]&] (* Harvey P. Dale, Oct 08 2017 *)

A039284 Numbers whose base-5 representation has the same nonzero number of 0's and 2's.

Original entry on oeis.org

10, 27, 35, 51, 53, 54, 55, 65, 70, 77, 85, 102, 110, 132, 136, 138, 139, 142, 147, 152, 160, 176, 178, 179, 180, 190, 195, 202, 210, 227, 235, 252, 256, 258, 259, 260, 266, 268, 269, 271, 273, 274, 276, 278, 279, 280, 290, 295, 300, 326, 328, 329, 330, 340
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.
Supersequence of A045177.

Programs

  • Mathematica
    Select[Range[400],DigitCount[#,5,0]==DigitCount[#,5,2]>0&] (* Harvey P. Dale, Oct 03 2014 *)
  • Python
    from sympy.ntheory import count_digits
def ok(n): c = count_digits(n, b=5); return c[0] == c[2] > 0
print([k for k in range(341) if ok(k)]) # Michael S. Branicky, Oct 27 2021

A039286 Numbers whose base-5 representation has the same nonzero number of 0's and 4's.

Original entry on oeis.org

20, 29, 45, 54, 70, 79, 95, 101, 102, 103, 105, 110, 115, 134, 139, 144, 146, 147, 148, 154, 170, 179, 195, 204, 220, 226, 227, 228, 230, 235, 240, 259, 264, 269, 271, 272, 273, 279, 295, 304, 320, 329, 345, 351, 352, 353, 355, 360, 365, 384, 389, 394, 396
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

A039291 Numbers whose base-5 representation has the same nonzero number of 2's and 4's.

Original entry on oeis.org

14, 22, 39, 47, 54, 59, 69, 70, 71, 73, 89, 97, 102, 107, 110, 111, 113, 117, 139, 147, 164, 172, 179, 184, 194, 195, 196, 198, 214, 222, 227, 232, 235, 236, 238, 242, 254, 259, 269, 270, 271, 273, 279, 284, 294, 295, 296, 298, 324, 329, 334, 344, 345, 346
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

Programs

  • Mathematica
    Select[Range[400],DigitCount[#,5,2]==DigitCount[#,5,4]>0&]  (* Harvey P. Dale, Apr 26 2011 *)

A039292 Numbers whose base-5 representation has the same nonzero number of 3's and 4's.

Original entry on oeis.org

19, 23, 44, 48, 69, 73, 79, 84, 89, 95, 96, 97, 103, 108, 113, 115, 116, 117, 144, 148, 169, 173, 194, 198, 204, 209, 214, 220, 221, 222, 228, 233, 238, 240, 241, 242, 269, 273, 294, 298, 319, 323, 329, 334, 339, 345, 346, 347, 353, 358, 363, 365, 366, 367
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

Programs

  • Mathematica
    Select[Range[500],DigitCount[#,5,3]==DigitCount[#,5,4]>0&] (* Harvey P. Dale, Jan 06 2012 *)

A039564 Numbers whose base-5 representation has the same number of 0's, 1's and 3's.

Original entry on oeis.org

2, 4, 12, 14, 22, 24, 28, 40, 62, 64, 72, 74, 76, 80, 112, 114, 122, 124, 138, 142, 144, 148, 178, 190, 202, 204, 210, 220, 228, 240, 258, 266, 278, 290, 312, 314, 322, 324, 326, 330, 362, 364, 372, 374, 382, 384, 386, 396, 402, 404, 410, 420, 426, 430, 476
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

A039565 Numbers whose base-5 representation has the same number of 0's, 1's and 4's.

Original entry on oeis.org

2, 3, 12, 13, 17, 18, 29, 45, 62, 63, 67, 68, 87, 88, 92, 93, 101, 105, 139, 144, 147, 148, 179, 195, 204, 220, 227, 228, 235, 240, 259, 271, 279, 295, 312, 313, 317, 318, 337, 338, 342, 343, 351, 355, 384, 396, 404, 420, 437, 438, 442, 443, 462, 463, 467
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

A039566 Numbers whose base-5 representation has the same number of 0's, 2's and 3's.

Original entry on oeis.org

1, 4, 6, 9, 21, 24, 31, 34, 46, 49, 53, 65, 77, 85, 106, 109, 121, 124, 138, 142, 156, 159, 171, 174, 178, 190, 202, 210, 231, 234, 246, 249, 258, 266, 269, 273, 278, 290, 326, 329, 330, 345, 353, 365, 382, 386, 389, 397, 402, 410, 426, 429, 430, 445, 477
Offset: 1

Views

Author

Olivier Gérard

Keywords

Crossrefs

Cf. A007091.

A039567 Numbers whose base-5 representation has the same number of 0's, 2's and 4's.

Original entry on oeis.org

1, 3, 6, 8, 16, 18, 31, 33, 41, 43, 54, 70, 81, 83, 91, 93, 102, 110, 139, 147, 156, 158, 166, 168, 179, 195, 206, 208, 216, 218, 227, 235, 259, 269, 271, 273, 279, 295, 329, 345, 351, 353, 355, 365, 389, 397, 406, 408, 416, 418, 429, 445, 456, 458, 466, 468
Offset: 1

Views

Author

Olivier Gérard

Keywords

Examples

			54 is a term since 54 in base 10 is 204 in base 5.

Links

Crossrefs

Cf. A007091, A039562, A039563, A039564, A039565, A039566.

Programs

  • Maple
    filter:= proc(n) local L,q;
  L:= convert(n,base,5);
  nops(map(numboccur,{0,2,4},L))=1
end proc:
select(filter,[$1..1000]); # Robert Israel, Apr 09 2018
  • Mathematica
    ok5Q[n_]:=Module[{dc5=DigitCount[n,5]},dc5[[2]]==dc5[[4]]==dc5[[5]]]; Select[Range[500],ok5Q]  (* Harvey P. Dale, Mar 05 2011 *)

A039572 Numbers whose base-5 representation has the same number of 2's, 3's and 4's.

Original entry on oeis.org

0, 1, 5, 6, 25, 26, 30, 31, 69, 73, 89, 97, 113, 117, 125, 126, 130, 131, 150, 151, 155, 156, 194, 198, 214, 222, 238, 242, 269, 273, 294, 298, 329, 334, 345, 346, 353, 358, 365, 366, 389, 397, 414, 422, 429, 434, 445, 446, 477, 482, 485, 486, 513, 517, 538
Offset: 1

Views

Author

Olivier Gérard

Keywords

Links

Crossrefs

Cf. A007091.

Programs

  • Mathematica
    Select[Range[0,600],DigitCount[#,5,2]==DigitCount[#,5,3]==DigitCount[#,5,4]&] (* Harvey P. Dale, Feb 02 2025 *)
Previous Showing 91-100 of 321 results. Next

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