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A085325
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a(n) is the least number such that the minimal exponent for which rev[a(n)^n]=prime holds is n. Thus rev[a(n)^k] is composite for k=1,..n.
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2
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2, 4, 52, 61, 43, 49, 29, 8, 223, 53, 83, 59, 25, 568, 47, 221, 229, 1286, 427, 629, 637, 46, 109, 652, 458, 925, 1438, 86, 674, 535
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| n=10, a(10)=53: This means that rev[53^10]=940315563074788471 is prime, but rev[53^k] is composite for k=1,...,9. Also, rev[a^10] for a<a(n)=53 is not prime. However a>53 is possible like e.g rev[103^10] is prime; 10 as the least exponent belongs to several bases of which a(10)=53 is the smallest one.
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CROSSREFS
| Cf. A085324.
Sequence in context: A181179 A175814 A156498 * A082661 A205616 A115587
Adjacent sequences: A085322 A085323 A085324 * A085326 A085327 A085328
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KEYWORD
| base,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 02 2003
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