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A053547
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Smallest prime containing leading sequence of n descending numbers.
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1
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11, 211, 3217, 432121, 543217, 65432117, 76543217, 876543211, 9876543211, 1098765432101, 11109876543211, 12111098765432101, 1312111098765432139, 141312111098765432113, 15141312111098765432173
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(6)=65432117 is smallest prime beginning with the string 654321.
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MATHEMATICA
| Flatten[Select[Join[10 #+Range[1, 9, 2], 100 #+Range[1, 99, 2]], PrimeQ, 1]&/@ Table[FromDigits[Flatten[IntegerDigits/@Range[n, 1, -1]]], {n, 25}]] (* From Harvey P. Dale, Nov 04 2011 *)
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CROSSREFS
| Sequence in context: A075858 A136307 A038399 * A053582 A077714 A089567
Adjacent sequences: A053544 A053545 A053546 * A053548 A053549 A053550
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KEYWORD
| easy,nice,nonn
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AUTHOR
| Enoch Haga (Enokh(AT)comcast.net), Jan 16 2000
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