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Search: id:A083576
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| A083576 |
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Least n-digit prime star number. |
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+0
1
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| 13, 181, 1093, 10333, 100621, 1040833, 10085473, 100000837, 1000705861, 10003758337, 100012479337, 1000001026513, 10000000794181, 100000078156441, 1000000776555301, 10000014919168441, 100000008716411701
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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a(1)=0 since there isn't a 1-digit prime star number.
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PROGRAM
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(PARI) star(n) = 6*n*(n-1)+1; L(n)=length(Str(n)); { stl(m)=print1(0", "); k=1; for(n=2, m, while(!isprime(star(k)) || L(star(k))!=n, k++); print1(star(k)", ")) }
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CROSSREFS
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Cf. A003154.
Sequence in context: A132386 A127390 A142646 this_sequence A122571 A001570 A020544
Adjacent sequences: A083573 A083574 A083575 this_sequence A083577 A083578 A083579
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jun 13 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Nov 23 2004
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