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Search: id:A074365
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| A074365 |
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Smallest prime > the concatenation of the first n natural numbers. |
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+0
1
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| 2, 13, 127, 1237, 12347, 123457, 1234577, 12345701, 123456791, 12345678923, 1234567891013, 123456789101119, 12345678910111223, 1234567891011121343, 123456789101112131449, 12345678910111213141523, 1234567891011121314151753
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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The first prime > 123, the concatenation of the first three natural numbers, is 127. Hence a(3) = 127.
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MATHEMATICA
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p[n_] := Module[{r, i}, r = 2; i = 1; While[r <= n, i = i + 1; r = Prime[i]]; r]; s = ""; a = {}; Do[s = s <> ToString[Prime[i]]; a = Append[a, p[ToExpression[s]]], {i, 1, 8}]; a
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CROSSREFS
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Sequence in context: A086630 A151361 A073559 this_sequence A071362 A108471 A036078
Adjacent sequences: A074362 A074363 A074364 this_sequence A074366 A074367 A074368
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 26 2002
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EXTENSIONS
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More terms from Lior Manor (lior.manor(AT)gmail.com) Oct 08 2002
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