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A032644
Numbers k such that k concatenated with k+4 is a lucky number.
1
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
CROSSREFS
Sequence in context: A022381 A206367 A039570 * A124877 A111517 A083545
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