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.

A031158 Twin lucky numbers (lower terms).

Original entry on oeis.org

1, 7, 13, 31, 49, 67, 73, 127, 133, 169, 193, 235, 259, 283, 319, 391, 427, 475, 487, 517, 535, 577, 613, 619, 643, 727, 739, 883, 895, 925, 931, 979, 991, 1009, 1021, 1039, 1093, 1105, 1201, 1231, 1249, 1261, 1387, 1417, 1471, 1495, 1501
Offset: 1

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Author

Patrick De Geest

Keywords

Links

Crossrefs

Cf. A000959, A031158, A031159, A031160.

A031160 Twin lucky numbers (middle terms).

Original entry on oeis.org

2, 8, 14, 32, 50, 68, 74, 128, 134, 170, 194, 236, 260, 284, 320, 392, 428, 476, 488, 518, 536, 578, 614, 620, 644, 728, 740, 884, 896, 926, 932, 980, 992, 1010, 1022, 1040, 1094, 1106, 1202, 1232, 1250, 1262, 1388, 1418, 1472, 1496, 1502
Offset: 1

Views

Author

Patrick De Geest

Keywords

Links

Crossrefs

Cf. A000959, A031158, A031159, A031160.

Extensions

Offset corrected by Amiram Eldar, Nov 15 2019

A348771 a(n) = A031160(n)/2.

Original entry on oeis.org

1, 4, 7, 16, 25, 34, 37, 64, 67, 85, 97, 118, 130, 142, 160, 196, 214, 238, 244, 259, 268, 289, 307, 310, 322, 364, 370, 442, 448, 463, 466, 490, 496, 505, 511, 520, 547, 553, 601, 616, 625, 631, 694, 709, 736, 748, 751, 772, 793, 799, 820, 883, 886, 916, 961
Offset: 1

Views

Author

N. J. A. Sloane, Nov 06 2021

Keywords

Links

Crossrefs

Cf. A000959, A031158, A031159, A031160.

Extensions

More terms from Amiram Eldar, Mar 09 2022

A055725 Number of isolated lucky numbers <= 10^n.

Original entry on oeis.org

0, 0, 9, 87, 762, 6448, 56580, 498141, 4447890
Offset: 0

Views

Author

Robert G. Wilson v, Jun 09 2000

Keywords

Comments

An isolated lucky number is a lucky number which is not a member of a lucky twin. The set of such numbers is A000959 setminus (A031158 union A031159). - Sean A. Irvine, Apr 04 2022

Crossrefs

Cf. A000959, A031158, A031159.

Extensions

a(7) and title clarified by Sean A. Irvine, Apr 04 2022
a(8) from Pontus von Brömssen, Apr 04 2022
Showing 1-4 of 4 results.

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

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