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A103853
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Numbers n such that the string 1000n is the decimal expansion of a prime number.
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1
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7, 9, 19, 43, 49, 57, 69, 117, 121, 133, 151, 159, 171, 183, 187, 193, 199, 211, 213, 231, 249, 253, 273, 289, 291, 303, 313, 333, 357, 367, 381, 393, 397, 403, 409, 423, 427, 429, 453, 457, 507, 537, 541, 547, 577, 579, 589, 609, 619, 621, 639, 651, 667
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 1..1000
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EXAMPLE
| 7 is in the sequence because 10007 is prime.
49 is in the sequence because 100049 is prime.
187 is in the sequence because 1000187 is prime.
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MATHEMATICA
| Select[Range[700], PrimeQ[FromDigits[Join[{1, 0, 0, 0}, IntegerDigits[#]]]]&] (* From Harvey P. Dale, Oct 03 2011 *)
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PROG
| (MAGMA) [ n: n in [1..800] | IsPrime(Seqint(Intseq(n) cat [0, 0, 0, 1])) ]; // Klaus Brockhaus, Feb 02 2011
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CROSSREFS
| Cf. A103601, A103602, A103603.
Sequence in context: A032791 A046257 A074343 * A192160 A139202 A125968
Adjacent sequences: A103850 A103851 A103852 * A103854 A103855 A103856
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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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