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A099148
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Take a <= b such that f(a)+f(b)=concatenation of a and b, where f(k)=k(k+3)/2 (A000096). Sequence gives values of a.
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3
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2, 3, 8, 9, 14, 15, 20, 39, 77, 98, 99, 138, 158, 164, 177, 200, 399, 492, 614, 998, 999, 1065, 1383, 1505, 1598, 1797, 1859, 1920, 2000, 2655, 3077, 3213, 3762, 3999, 6707
(list; graph; refs; listen; history; internal format)
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