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Search: id:A103601
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| A103601 |
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Numbers n such that the string 10n is prime. |
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+0
4
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| 1, 3, 7, 9, 13, 19, 21, 31, 33, 39, 49, 51, 61, 63, 69, 87, 91, 93, 97, 103, 111, 133, 139, 141, 151, 159, 163, 169, 177, 181, 193, 211, 223, 243, 247, 253, 259, 267, 271, 273, 289, 301, 303, 313, 321, 331, 333, 337, 343, 357, 369, 391, 399, 427, 429, 433, 453
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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If n=1, then 10n = 101 (prime).
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MATHEMATICA
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A103601=Reap[For[n=1, n<10^3, If[PrimeQ[n+10^Floor[Log[10, 100n]]], Sow[n]]; n+=2]][[2, 1]] [From Zak Seidov (zakseidov(AT)yahoo.com), Dec 15 2008]
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CROSSREFS
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Sequence in context: A088649 A020498 A107771 this_sequence A111250 A118643 A043772
Adjacent sequences: A103598 A103599 A103600 this_sequence A103602 A103603 A103604
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KEYWORD
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base,nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 23 2005
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EXTENSIONS
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More terms from Zak Seidov (zakseidov(AT)yahoo.com), Dec 15 2008
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