A032644 Numbers k such that k concatenated with k+4 is a lucky number.

1, 3, 15, 19, 21, 39, 55, 63, 73, 85, 99, 111, 117, 135, 159, 165, 201, 219, 261, 267, 273, 327, 333, 345, 357, 369, 381, 399, 423, 471, 483, 495, 513, 525, 537, 579, 585, 597, 603, 615, 621, 639, 675, 687, 693, 699, 741, 789, 831, 837, 879, 885, 891, 915, 975

Offset

1,2

Links

Table of n, a(n) for n=1..55.

Crossrefs

Cf. A000959, A032654.

Sequence in context: A022381 A206367 A039570 * A124877 A111517 A083545

Adjacent sequences: A032641 A032642 A032643 * A032645 A032646 A032647

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Extensions

More terms from Sascha Kurz, Mar 24 2002

Incorrect 681 removed and more terms from Sean A. Irvine, Jun 24 2020

Status

approved