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A083988
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Primes p such that concatenation p, 0, R(p) is also a prime (of course a palindromic prime).
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1
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31, 73, 139, 149, 163, 167, 173, 193, 197, 331, 347, 359, 367, 397, 719, 769, 911, 947, 967, 977, 1033, 1039, 1069, 1087, 1091, 1109, 1171, 1279, 1427, 1433, 1447, 1487, 1499, 1543, 1567, 1571, 1601, 1607, 1627, 1709, 1759, 1777, 1801, 1861, 1871, 1879
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OFFSET
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1,1
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COMMENTS
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Concatenation p and R(p) is a composite number (a multiple of 11).
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LINKS
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EXAMPLE
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31 is a member as 31013 is also prime.
139 is a member as 1390931 is also a prime.
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MATHEMATICA
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Select[Prime[Range[300]], PrimeQ[FromDigits[Join[IntegerDigits[#], {0}, Reverse[ IntegerDigits[ #]]]]]&] (* Harvey P. Dale, Oct 03 2022 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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