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A235149
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Primes p such that (p reversed) + 7 is also a prime.
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1
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43, 61, 67, 229, 241, 271, 283, 409, 421, 439, 457, 601, 643, 661, 673, 2011, 2017, 2029, 2113, 2131, 2161, 2179, 2221, 2269, 2287, 2293, 2341, 2389, 2437, 2467, 2521, 2551, 2557, 2707, 2749, 2791, 2803, 2833, 2857, 4003, 4027, 4051, 4093, 4129, 4159, 4201, 4339, 4357
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Prime[Range[6000]], PrimeQ[FromDigits[Reverse[IntegerDigits[#]]] + 7]&]
Select[Prime[Range[600]], PrimeQ[IntegerReverse[#]+7]&] (* Harvey P. Dale, May 20 2023 *)
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PROG
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(Magma) [p: p in PrimesUpTo(6000) | IsPrime(q+7) where q is Seqint(Reverse(Intseq(p)))];
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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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STATUS
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approved
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