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Search: id:A104179
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| A104179 |
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Primes that are either single-digit primes or a concatenation of two earlier terms. |
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+0
1
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| 2, 3, 5, 7, 23, 37, 53, 73, 223, 233, 337, 353, 373, 523, 733, 773, 2237, 2333, 3373, 3533, 3733, 5233, 5237, 5323, 7333, 7523, 23333, 23773, 25237, 32237, 33533, 33773, 35323, 35353, 37223, 37337, 52237, 53233, 53353, 53773, 73523, 75323, 77323
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Jean-Marc Falcoz, Table of n, a(n) for n = 1..1003
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FORMULA
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Up to 10^12 there are only 1003 terms and the n-th term seems to be roughly n^(10/e). - Jean-Marc Falcoz (jeanmarcfalcoz(at)vtxnet.ch), Mar 28 2009
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PROGRAM
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(PARI from Maximilian Hasler) isDW(p, i=1)={while(p>i*=10, setminus(Set(divrem(p, i)), a)|return(eval(Set(Vec(Str(p)))[1]))); p<9}
a=[]; forprime( p=2, 99999, isDW(p) & !print1(p", ") & a=setunion(a, Set(p)))
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CROSSREFS
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Sequence in context: A154385 A125525 A019546 this_sequence A096148 A124674 A020994
Adjacent sequences: A104176 A104177 A104178 this_sequence A104180 A104181 A104182
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KEYWORD
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nonn,base
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net), Mar 27 2009
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EXTENSIONS
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More terms from Maximilian Hasler (maximilian.hasler(AT)gmail.com), Mar 28 2009
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