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A103967
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Numbers n such that the string n1n is the decimal expansion of a prime number.
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0
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3, 9, 17, 21, 27, 29, 39, 41, 47, 51, 59, 71, 81, 87, 89, 113, 117, 119, 131, 137, 141, 159, 161, 177, 189, 201, 239, 263, 287, 291, 299, 333, 359, 371, 377, 389, 393, 399, 443, 459, 461, 467, 471, 489, 509, 539, 573, 603, 623, 653, 657, 659, 663, 671, 681
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| n=3 is in the sequence because n1n = 313 is prime.
n=41 is in the sequence because n1n = 41141 is prime.
n=89 is in the sequence because n1n = 89189 is prime.
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PROG
| (MAGMA) [ n: n in [0..800] | IsPrime(Seqint(Intseq(n) cat [1] cat Intseq(n))) ]; // Klaus Brockhaus, Feb 03 2011
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CROSSREFS
| Sequence in context: A106676 A050795 A050797 * A032400 A004621 A014209
Adjacent sequences: A103964 A103965 A103966 * A103968 A103969 A103970
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KEYWORD
| base,nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 30 2005
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