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A176553
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a(n) = numbers m such that concatenations of divisors of m are noncomposites.
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4
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1, 3, 7, 9, 13, 21, 31, 37, 67, 73, 79, 97, 103, 109, 121, 151, 163, 181, 183, 193, 219, 223, 229, 237, 27, 283, 307, 363, 367, 373, 381, 409, 433, 439, 471, 487, 489, 499, 511, 523, 571, 601, 603, 607, 63, 619, 657, 669, 709, 733, 787, 811, 817, 819, 823, 841, 867
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