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A058993
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Numbers m such that 5^m reversed is a prime.
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8
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1, 3, 26, 36, 43, 66, 76, 149, 511, 885, 3767, 18157, 20516, 26316
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[ ToExpression[ StringReverse[ ToString[5^n] ] ] ], Print[n] ], {n, 1, 3000} ]
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PROG
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(Python)
from sympy import isprime
while k <= 10**3:
if isprime(int(str(m)[::-1])):
k += 1
(PARI) isok(m) = isprime(fromdigits(Vecrev(digits(5^m)))) \\ Mohammed Yaseen, Jul 20 2022
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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