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A046036 Indices of the concatenation of the first n odd numbers (A019519) which are primes. 4
2, 10, 16, 34, 49, 2570 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No others with n <= 12000. - Eric W. Weisstein, Mar 01 2004

LINKS

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

FORMULA

a(n) = (A066811(n)+1)/2. - Michel Marcus, Jan 31 2014

MATHEMATICA

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 *)

CROSSREFS

Cf. A019519, A048847.

Sequence in context: A189329 A242089 A110761 * A131474 A249153 A276046

Adjacent sequences: A046033 A046034 A046035 * A046037 A046038 A046039

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein

STATUS

approved

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Last modified January 29 21:02 EST 2023. Contains 359931 sequences. (Running on oeis4.)