202

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202 is the only known palindromic semiprime with following property: 202 = 2*101. Concatenate its prime factors (2101) then add the prime factors of 2101 (i.e., 11 + 191) to return to 202. No other such runs up to 100 million. [Luhn]

Submitted: 2020-09-15 09:13:10; Last Modified: 2022-11-16 02:25:22.