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A058997
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Least power k greater than 1 for which n^k reversed is a prime, or 0 if impossible.
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0
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0, 4, 0, 2, 3, 0, 12, 8, 0, 0, 0, 0, 379, 2, 0, 6, 11, 0, 2, 0, 0, 0, 8, 0, 13, 47, 0, 2, 7, 0, 4, 2, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| Do[ If[ Mod[ n, 3 ] != 0 && Mod[ n, 10 ] != 0 && Mod[ n, 11 ] != 0, k = 2; While[ !PrimeQ[ ToExpression[ StringReverse[ ToString[ n^k ] ] ] ], k++ ]; Print[ k ], Print[ 0 ] ], {n, 2, 33} ]
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CROSSREFS
| Sequence in context: A180850 A109157 A123314 * A201399 A145894 A021881
Adjacent sequences: A058994 A058995 A058996 * A058998 A058999 A059000
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KEYWORD
| base,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 17 2001
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