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Search: id:A108757
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| A108757 |
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Numbers n such that the string n911 is prime. |
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+0
1
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| 0, 3, 6, 12, 17, 18, 21, 23, 30, 32, 33, 35, 41, 47, 56, 69, 72, 80, 83, 87, 90, 93, 95, 96, 98, 102, 104, 116, 117, 123, 132, 135, 137, 149, 153, 159, 161, 164, 167, 188, 191, 194, 201, 203, 206, 210, 216, 219, 224, 228, 233, 237, 242, 243, 245, 249, 252, 254, 263
(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=0 then n911 = 0911 (prime).
If n=32 then n911 = 32911 (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, 911))=true then n else fi end: seq(a(n), n=0..360); # c is the process which concatenates two positive integers (Deutsch)
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CROSSREFS
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Sequence in context: A086538 A127563 A125627 this_sequence A038046 A038588 A111041
Adjacent sequences: A108754 A108755 A108756 this_sequence A108758 A108759 A108760
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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 25 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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