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A109369
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Numbers n such that the string 33n is the decimal expansion of a prime number.
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0
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1, 7, 13, 19, 23, 29, 31, 43, 47, 59, 61, 71, 73, 89, 91, 107, 113, 119, 149, 151, 161, 179, 181, 191, 199, 203, 211, 223, 247, 287, 289, 301, 311, 317, 329, 331, 343, 347, 349, 353, 359, 377, 391, 403, 409, 413, 427, 457, 461, 469, 479, 487, 493, 503, 521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 1 is in the sequence because 331 is prime.
59 is in the sequence because 3359 is prime.
107 is in the sequence because 33107 is prime.
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MAPLE
| a:=proc(n) if isprime(33*10^nops(convert(n, base, 10))+n)=true then n else fi end: seq(a(n), n=0..600); (Deutsch)
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PROG
| (MAGMA) [ n: n in [1..600] | IsPrime(Seqint(Intseq(n) cat [3, 3])) ];
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CROSSREFS
| Sequence in context: A007921 A092409 A124095 * A088982 A176406 A033561
Adjacent sequences: A109366 A109367 A109368 * A109370 A109371 A109372
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KEYWORD
| nonn,base
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Aug 24 2005
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Sep 02 2005
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