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A089713
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a(n) is the largest prime that is the concatenation of n and m for some m < n, or 0 if no such prime exists.
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2
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0, 0, 31, 43, 53, 61, 73, 83, 97, 109, 113, 127, 139, 149, 1511, 1613, 179, 1811, 1913, 2017, 2113, 2221, 2311, 2423, 2521, 2621, 2719, 2819, 2927, 3023, 3121, 3229, 3331, 3433, 3533, 3631, 3733, 3833, 3931, 4027, 4139, 4241, 4339, 4441, 4523, 4643, 4733
(list; graph; refs; listen; history; internal format)
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