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Search: id:A067194
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| A067194 |
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Sequence of prime numbers whose reverse is a nontrivial prime power (A025475). |
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+0
2
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| 23, 61, 163, 521, 821, 1297, 1861, 4201, 9049, 9631, 12391, 14437, 16987, 92767, 94273, 96979, 108061, 123031, 125329, 127291, 142771, 148249, 165901, 180289, 270131, 906421, 906727, 906751, 921931, 942013, 942691, 965443, 969407, 986641
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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23 is a prime and its reversal is 32 = 2^5.
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MATHEMATICA
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a = {}; Do[ If[ PrimeQ[n], b = ToExpression[ StringReverse[ ToString[n]]]; If[ !PrimeQ[b] && Mod[b, b - EulerPhi[b]] == 0, a = Append[a, n]]], {n, 1, 10^6} ]; a
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CROSSREFS
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Cf. A025475, A007488, A069798.
Sequence in context: A141870 A115685 A069798 this_sequence A107692 A089823 A001346
Adjacent sequences: A067191 A067192 A067193 this_sequence A067195 A067196 A067197
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KEYWORD
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nonn,base
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Feb 19 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 19 2002 and Feb 24, 2002
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