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A032654
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Lucky numbers that are concatenations of n with n + 4.
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1
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15, 37, 1519, 1923, 2125, 3943, 5559, 6367, 7377, 8589, 99103, 111115, 117121, 135139, 159163, 165169, 201205, 219223, 261265, 267271, 273277, 327331, 333337, 345349, 357361, 369373, 381385, 399403, 423427, 471475, 483487, 495499, 513517
(list; graph; refs; listen; history; internal format)
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