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Search: id:A084669
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| A084669 |
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Primes which are a concatenation of prime[n] and n. |
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+0
1
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| 53, 239, 6719, 7321, 15737, 30763, 38977, 41981, 44987, 587107, 661121, 751133, 1051177, 1229201, 1297211, 1303213, 1327217, 1823281, 1913293, 1999303, 2131321, 2179327, 2207329, 2239333, 2371351, 2689391, 2699393, 3067439
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(2)=239 because prime[9]=23 and concatenation of 23 and 9 is 239 which is prime
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MATHEMATICA
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Select[Table[FromDigits[Flatten[{IntegerDigits[Prime[n]], IntegerDigits[n]}]], {n, 1, 500}], PrimeQ]
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CROSSREFS
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Sequence in context: A053652 A142316 A142026 this_sequence A142357 A142061 A107150
Adjacent sequences: A084666 A084667 A084668 this_sequence A084670 A084671 A084672
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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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