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A101784
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Primes which remain prime after omitting maximal digit.
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0
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23, 29, 37, 43, 53, 59, 73, 79, 83, 97, 113, 131, 137, 139, 151, 163, 173, 179, 181, 191, 193, 197, 199, 211, 233, 239, 263, 283, 293, 311, 313, 317, 331, 379, 397, 419, 431, 439, 443, 461, 463, 479, 487, 491, 503, 523, 541, 563, 593, 599, 613, 617, 619, 631
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OFFSET
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1,1
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COMMENTS
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If there are several maximal digits, first from left is omitted.
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LINKS
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MATHEMATICA
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omit[d_, list_] := Module[{aux = {}, len = Length[list]}, Do[If[list[[i]] == d, none, aux = Join[aux, {list[[i]]}]], {i, len}]; aux]; maxomit[n_] := omit[Max[IntegerDigits[Prime[n]]], IntegerDigits[Prime[n]]]; convert[lis_] := Sum[Reverse[lis][[i]] 10^(i - 1), {i, 1, Length[lis]}]; Table[If[PrimeQ[convert[maxomit[n]]], Prime[n], 0], {n, 1, 300}] //Union //Rest [From Jose Grau, Feb 17 2010]
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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