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A046036
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Indices of the concatenation of the first n odd numbers (A019519) which are primes.
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4
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OFFSET
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1,1
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COMMENTS
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No others with n <= 12000. - Eric W. Weisstein, Mar 01 2004
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LINKS
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Table of n, a(n) for n=1..6.
H. Ibstedt, A Few Smarandache Integer Sequences, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, pp. 171-183.
Eric Weisstein's World of Mathematics, Consecutive Number Sequences
Eric Weisstein's World of Mathematics, Integer Sequence Primes
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FORMULA
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a(n) = (A066811(n)+1)/2. - Michel Marcus, Jan 31 2014
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MATHEMATICA
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Module[{nn=50, odds}, odds=Range[1, 2nn+1, 2]; Position[Table[ FromDigits[ Flatten[IntegerDigits/@Take[odds, n]]], {n, nn}], _?(PrimeQ[#]&)]]// Flatten (* The program generates the first 5 terms of the sequence. To generate the 6th, increase the value of nn to 2570 or more, but the program will take a long time to run. *) (* Harvey P. Dale, Jul 21 2021 *)
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CROSSREFS
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Cf. A019519, A048847.
Sequence in context: A189329 A242089 A110761 * A131474 A249153 A276046
Adjacent sequences: A046033 A046034 A046035 * A046037 A046038 A046039
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KEYWORD
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nonn,base
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AUTHOR
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Eric W. Weisstein
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STATUS
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approved
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