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A192608
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Numbers n such that the concatenation of n^5 n^4 n^3 n^2 n^1 n^0 is prime.
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3
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9, 39, 69, 228, 294, 594, 612, 801, 849, 921, 984, 1821, 1827, 1842, 1854, 1872, 1893, 1896, 2031, 2193, 2202, 2319, 2370, 2421, 2454, 2466, 2508, 2535, 2604, 2607, 2712, 2997, 3009, 3084, 3102, 3108, 3351, 3477, 3843, 3879, 3897, 3900, 3921, 4095, 4161
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OFFSET
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1,1
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LINKS
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EXAMPLE
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9 is in the list because the concatenation of 9^5 9^4 9^3 9^2 9^1 9^0 is 5904965617298191 and this number is prime.
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MATHEMATICA
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Select[Range[4200], PrimeQ[FromDigits[Flatten[IntegerDigits/@{#^5, #^4, #^3, #^2, #, 1}]]]&] (* Harvey P. Dale, Jun 25 2022 *)
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PROG
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(PARI) isok(n) = {s = ""; for(i=0, 5, s = concat(Str(n^i), s)); isprime(eval(s)); } \\ Michel Marcus, Feb 04 2014
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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