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Search: id:A084667
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| A084667 |
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Primes which are a concatenation of n and prime[n]. |
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+0
1
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| 23, 47, 613, 1237, 1759, 1861, 2383, 27103, 30113, 35149, 36151, 41179, 42181, 45197, 46199, 54251, 56263, 57269, 58271, 61283, 71353, 82421, 83431, 85439, 92479, 93487, 99523, 115631, 117643, 119653, 121661, 123677, 127709, 136769
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(3)=613 because prime[6]=13 and concatenation of 6 and 13 is 613 which is prime
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MATHEMATICA
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Select[Table[FromDigits[Flatten[{IntegerDigits[n], IntegerDigits[Prime[n]]}]], {n, 1, 500}], PrimeQ] (from Alonso Delarte (alonso.delarte(AT)gmail.com))
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CROSSREFS
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Sequence in context: A054679 A054203 A042054 this_sequence A157358 A158238 A042056
Adjacent sequences: A084664 A084665 A084666 this_sequence A084668 A084669 A084670
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003
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