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A109948
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Smallest prime == 1 (mod f(n)), where f(n) = concatenation n,n-1,...,3,2,1.
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3
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2, 43, 643, 51853, 108643, 3925927, 45925927, 525925927, 9876543211, 65925925927, 6665925925927, 1453331851851853, 1154657766913580249, 45219875551604938273, 7873482297771358024693, 742965003571105432098767
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| s = "1"; Do[s = ToString[n] <> s; k = ToExpression[s]; i = 1; While[ !PrimeQ[i*k + 1], i++ ]; Print[i*k + 1], {n, 2, 30}] (Propper)
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CROSSREFS
| Cf. A109947.
Sequence in context: A073594 A112097 A142199 * A188683 A119775 A088466
Adjacent sequences: A109945 A109946 A109947 * A109949 A109950 A109951
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 20 2005
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Aug 01 2005
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