A032650 -id:A032650 - cp's OEIS frontend

A032640 Numbers k such that k concatenated with itself is a lucky number.

3, 9, 21, 23, 51, 59, 63, 71, 75, 87, 89, 99, 105, 111, 117, 123, 129, 135, 143, 147, 153, 171, 173, 177, 191, 201, 237, 243, 255, 263, 285, 305, 309, 317, 327, 357, 363, 369, 371, 387, 389, 393, 431, 443, 459, 465, 467, 495, 497, 513, 521, 533, 561, 567, 573

Offset: 1

Patrick De Geest, May 15 1998

			123 is a member of the sequence since 123123 is a lucky number, i.e. A000959(10590) = 123123.

Kevin P. Thompson, Table of n, a(n) for n = 1..4215 (first 95 terms from Amiram Eldar)

Cf. A000959, A032650.

More terms from Sascha Kurz, Mar 24 2002

A032661 Lucky numbers that are the smallest decimal concatenations of n with n + (0,1,2,3,...).

Original entry on oeis.org

33, 67, 13, 25, 15, 49, 511, 613, 5967, 211, 111, 415, 517, 619, 115, 621, 319, 219, 321, 1029, 727, 223, 729, 427, 327, 429, 127, 1441, 129, 231, 535, 1041, 133, 235, 135, 237, 339, 643, 745, 241, 141, 1455, 2163, 1053, 1155, 651, 349, 451, 553, 655

Offset: 0

Patrick De Geest, May 15 1998

First terms of sequences A032650-A032659, continued with displacements d > 9.

			20th term is lucky number 1029: 29 - 10 = displacement 19 (=20-1).

Cf. A000959, A032660.

Edited by Charles R Greathouse IV, Apr 30 2010

cp's OEIS Frontend

A032640 Numbers k such that k concatenated with itself is a lucky number.

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