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A103602
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Numbers k such that the string 10100k is the decimal expansion of a prime number.
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4
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9, 33, 69, 81, 83, 107, 113, 117, 131, 147, 161, 173, 177, 179, 201, 213, 219, 221, 249, 273, 287, 291, 333, 351, 383, 393, 407, 423, 429, 443, 449, 459, 471, 501, 507, 527, 537, 539, 543, 557, 579, 603, 617, 633, 639, 641, 659, 677, 683, 689, 711, 747
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OFFSET
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1,1
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LINKS
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EXAMPLE
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9, 107 and 147 are in the sequence because 101009, 10100107 and 10100147 are prime.
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PROG
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(Magma) [ n: n in [1..800] | IsPrime(Seqint(Intseq(n) cat [0, 0, 1, 0, 1])) ];
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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