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A109843
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Least multiple of n with digit reversal a prime, or 0 if no such multiple exists.
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0
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2, 2, 3, 16, 5, 0, 7, 16, 0, 20, 11, 0, 13, 14, 0, 16, 17, 0, 38, 20, 0, 110, 92, 0, 50, 104, 0, 112, 145, 30, 31, 32, 0, 34, 35, 0, 37, 38, 0, 160, 164, 0, 172, 1100, 0, 92, 188, 0, 98, 50, 0, 104, 106, 0, 110, 112, 0, 754, 118, 0, 305, 124, 0, 128, 130, 0, 134, 136, 0, 70, 71, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(3k) = 0, k > 0.
A subsidiary sequence could be obtained by replacing a(3n) by the least multiple of n which on division by largest power of 3 that divides it gives a number whose digit reversal is prime.
Note also that a(77) = 0. - Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 04 2006
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CROSSREFS
| Sequence in context: A189312 A153938 A060790 * A184840 A164022 A089751
Adjacent sequences: A109840 A109841 A109842 * A109844 A109845 A109846
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 06 2005
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EXTENSIONS
| More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 04 2006
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