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A037287
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Replace 2n+1 by concatenation of its divisors >1.
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0
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0, 3, 5, 7, 39, 11, 13, 3515, 17, 19, 3721, 23, 525, 3927, 29, 31, 31133, 5735, 37, 31339, 41, 43, 3591545, 47, 749, 31751, 53, 51155, 31957, 59, 61, 3792163, 51365, 67, 32369, 71, 73, 35152575, 71177, 79, 392781, 83, 51785, 32987, 89, 71391, 33193
(list; graph; refs; listen; history; internal format)
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