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Search: id:A108113
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| A108113 |
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Numbers n such that the string 3137n is prime. |
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+0
1
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| 9, 11, 17, 21, 27, 39, 41, 63, 77, 83, 117, 137, 143, 159, 171, 179, 201, 209, 243, 257, 263, 311, 357, 371, 389, 399, 447, 461, 471, 507, 509, 513, 521, 531, 551, 567, 569, 573, 593, 609, 611, 623, 627, 663, 669, 681, 699, 723, 731, 747, 749, 777, 803, 837
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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31 and 37 are primes.
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EXAMPLE
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If n=9, then 3137n = 31379 (prime).
If n=83, then 3137n = 313783 (prime).
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MAPLE
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a:=proc(n) local z: z:=nops(convert(n, base, 10)): if isprime(3137*10^z+n)=true then n else fi end: seq(a(n), n=1..1000); (Deutsch)
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CROSSREFS
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Sequence in context: A063191 A048464 A075824 this_sequence A111391 A077788 A137018
Adjacent sequences: A108110 A108111 A108112 this_sequence A108114 A108115 A108116
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KEYWORD
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nonn,base
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Jun 25 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 02 2005
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