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Search: id:A068839
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| A068839 |
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Smallest prime that ends with the right concatenation of first n odd numbers. |
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+0
1
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| 11, 31, 1531, 67531, 1397531, 311197531, 16131197531, 2515131197531, 71715131197531, 33191715131197531, 7621191715131197531, 232321191715131197531, 7252321191715131197531
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OFFSET
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1,1
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EXAMPLE
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a(5) = 1397531 which contains as trailing digits the right concatenation of first 5 odd numbers 97531.
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MATHEMATICA
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a068839[n_] := Module[{}, a1=Flatten[Table[IntegerDigits[i], {i, n, 1, -2}]]; FromDigits[pref=1; a2=a1; While[ !PrimeQ[FromDigits[a2]], a2=Join[IntegerDigits[pref], a1]; pref+=1]; a2]]; Table[a068839[i], {i, 1, 33, 2}]
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CROSSREFS
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Cf. A068837, A068838.
Sequence in context: A111015 A143765 A023306 this_sequence A060857 A045982 A059134
Adjacent sequences: A068836 A068837 A068838 this_sequence A068840 A068841 A068842
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 10 2002
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EXTENSIONS
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More terms from Vit Planocka (planocka(AT)mistral.cz), Oct 18 2002
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