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.

A256483 a(n) = A256482(n)/2 = (A254100(n) - A003309(n+1)) / 2.

Original entry on oeis.org

1, 3, 7, 12, 22, 30, 42, 61, 71, 88, 108, 126, 137, 154, 180, 206, 227, 249, 273, 297, 324, 336, 368, 405, 434, 454, 465, 497, 520, 565, 594, 627, 655, 699, 722, 742, 750, 807, 874, 890, 933, 945, 972, 1006, 1020, 1048, 1077, 1120, 1164, 1218, 1244, 1272, 1338, 1370, 1400, 1474, 1488, 1517, 1545, 1605, 1627
Offset: 1

Views

Author

Antti Karttunen, May 01 2015

Keywords

Links

Crossrefs

Column 1 of A257258.
Cf. A003309, A254100, A256482.
Cf. also A256486, A256487.

Programs

Formula

a(n) = A256482(n)/2 = (A254100(n) - A003309(n+1)) / 2.

A256486 Difference between n-th Ludic and n-th Lucky number: a(n) = A003309(n) - A000959(n).

Original entry on oeis.org

0, -1, -4, -4, -6, -4, -8, -8, -8, -8, -8, -6, -8, -8, -16, -14, -8, -6, -4, -2, -4, -4, -8, -8, -4, 0, -8, -8, -6, -4, 2, -2, -2, -2, 4, 4, -10, -12, -2, 8, 6, 10, 4, 4, 2, 0, 2, 6, -2, 4, 10, 10, 4, 16, 18, 16, 26, 24, 18, 20, 26, 28, 22, 28, 26, 28, 30, 22, 24, 26, 22, 22, 18, 16, 18, 34, 34, 24, 18, 18, 20, 20
Offset: 1

Views

Author

Antti Karttunen, May 01 2015

Keywords

Links

Crossrefs

Cf. A000959, A003309, A256482, A256487.

Programs

Formula

a(n) = A003309(n) - A000959(n).

A256487 a(n) = A254100(n) - A219178(n).

Original entry on oeis.org

2, 4, 0, 4, 10, 18, 16, 36, 28, 48, 78, 80, 62, 90, 76, 110, 134, 158, 200, 220, 224, 216, 236, 280, 308, 312, 262, 314, 328, 402, 430, 424, 438, 488, 506, 538, 414, 510, 642, 620, 680, 648, 656, 690, 666, 684, 730, 790, 742, 840, 844, 862, 916, 976, 1004, 1092, 1072, 1112, 1054, 1166, 1176, 1184, 1292
Offset: 1

Views

Author

Antti Karttunen, May 01 2015

Keywords

Comments

Difference between the least nonludic number removed at the n-th stage of Ludic sieve and the least unlucky number removed at the n-th stage of Lucky sieve.

Links

Crossrefs

Cf. A219178, A254100, A256482, A256486, A256488 (same terms divided by 2).

Programs

Formula

a(n) = A254100(n) - A219178(n).

A257257 Square array A(row,col) = A255127(row,col+1) - A255127(row,col): the first differences of each row of Ludic array.

Original entry on oeis.org

2, 2, 6, 2, 6, 14, 2, 6, 16, 24, 2, 6, 14, 28, 44, 2, 6, 16, 26, 48, 60, 2, 6, 14, 28, 48, 60, 84, 2, 6, 16, 24, 52, 64, 86, 122, 2, 6, 14, 26, 48, 66, 94, 126, 142, 2, 6, 16, 28, 48, 62, 86, 132, 144, 176, 2, 6, 14, 26, 44, 60, 94, 120, 146, 166, 216, 2, 6, 16, 24, 48, 64, 86, 132, 142, 180, 234, 252
Offset: 1

Views

Author

Antti Karttunen, Apr 19 2015

Keywords

Comments

The array A(row,col) is read by downwards antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

Examples

			The top left corner of the array:
    2,   2,   2,   2,   2,   2,   2,   2,   2,   2,   2,   2,   2,   2,   2
    6,   6,   6,   6,   6,   6,   6,   6,   6,   6,   6,   6,   6,   6,   6
   14,  16,  14,  16,  14,  16,  14,  16,  14,  16,  14,  16,  14,  16,  14
   24,  28,  26,  28,  24,  26,  28,  26,  24,  28,  26,  28,  24,  26,  28
   44,  48,  48,  52,  48,  48,  44,  48,  52,  48,  48,  48,  44,  52,  48
   60,  60,  64,  66,  62,  60,  64,  62,  60,  70,  60,  60,  62,  64,  60
   84,  86,  94,  86,  94,  86,  82,  92,  88,  92,  88,  90,  90,  84,  90
  122, 126, 132, 120, 132, 126, 130, 126, 120, 132, 128, 126, 130, 128, 126
  142, 144, 146, 142, 146, 138, 150, 148, 140, 148, 146, 138, 150, 138, 150
  176, 166, 180, 168, 176, 178, 170, 178, 170, 180, 174, 172, 176, 178, 176
  216, 234, 226, 242, 228, 226, 240, 218, 234, 246, 220, 230, 234, 226, 234
  252, 270, 254, 274, 258, 254, 258, 276, 262, 266, 258, 256, 264, 276, 264
  274, 284, 268, 284, 304, 270, 282, 278, 294, 282, 282, 276, 282, 288, 292
  308, 316, 314, 316, 320, 316, 312, 308, 324, 336, 316, 302, 316, 314, 322
  360, 360, 354, 368, 360, 372, 370, 368, 352, 360, 380, 354, 370, 380, 352
  412, 434, 424, 420, 426, 440, 426, 420, 432, 424, 422, 444, 424, 422, 430
  ...

Links

Crossrefs

Column 1: A256482.
Cf. A255127.
Cf. A257258 (same array but with terms divided by 2).
Cf. also arrays A257251 and A257255.

Programs

Formula

A(row,col) = A255127(row,col+1) - A255127(row,col).
A(row,col) = 2*A257258(row,col).

A256488 a(n) = A256487(n)/2 = (A254100(n) - A219178(n))/2.

Original entry on oeis.org

1, 2, 0, 2, 5, 9, 8, 18, 14, 24, 39, 40, 31, 45, 38, 55, 67, 79, 100, 110, 112, 108, 118, 140, 154, 156, 131, 157, 164, 201, 215, 212, 219, 244, 253, 269, 207, 255, 321, 310, 340, 324, 328, 345, 333, 342, 365, 395, 371, 420, 422, 431, 458, 488, 502, 546, 536, 556, 527, 583, 588, 592, 646, 643, 639, 665, 688, 662, 662
Offset: 1

Views

Author

Antti Karttunen, May 01 2015

Keywords

Comments

Half the difference between the least nonludic number removed at the n-th stage of Ludic sieve and the least unlucky number removed at the n-th stage of Lucky sieve.

Links

Crossrefs

Cf. A219178, A254100, A256482, A256486, A256487.

Programs

Formula

a(n) = A256487(n)/2 = (A254100(n) - A219178(n))/2.
Showing 1-5 of 5 results.

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

Content is available under The OEIS End-User License Agreement.