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Search: id:A109605
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| A109605 |
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Numbers n such that the string n91111 is prime. |
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+0
1
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| 6, 7, 12, 18, 30, 39, 67, 69, 72, 82, 96, 105, 109, 118, 120, 123, 132, 142, 144, 147, 148, 156, 159, 166, 175, 181, 184, 195, 204, 205, 211, 223, 225, 228, 243, 244, 246, 247, 259, 270, 271, 288, 303, 312, 334, 342, 343, 345, 351, 355, 364, 366, 376, 379, 382
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If n=96 then n91111 = 9691111 (prime).
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MAPLE
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c:=proc(x, y) local s: s:=proc(m) nops(convert(m, base, 10)) end: x*10^s(y)+y: end: a:=proc(n) if isprime(c(n, 91111))=true then n else fi end: seq(a(n), n=0..400); # c is the process which concatenates two positive integers (Deutsch)
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CROSSREFS
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Sequence in context: A047225 A037364 A105329 this_sequence A069198 A069136 A047335
Adjacent sequences: A109602 A109603 A109604 this_sequence A109606 A109607 A109608
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jul 30 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 07 2005
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