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A092447 Concatenate odd primes in decreasing order. 6


%S 3,53,753,11753,1311753,171311753,19171311753,2319171311753,

%T 292319171311753,31292319171311753,3731292319171311753,

%U 413731292319171311753,43413731292319171311753,4743413731292319171311753,534743413731292319171311753,59534743413731292319171311753

%N Concatenate odd primes in decreasing order.

%H Andrew Howroyd, <a href="/A092447/b092447.txt">Table of n, a(n) for n = 1..100</a>

%H M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/SmBackConOddPrimes.htm">Smarandache Back Concatenated Odd Primes</a>

%H H. Marimutha, <a href="http://www.gallup.unm.edu/~smarandache/smarcon.htm">Smarandache Concatenated Type Sequences</a>, Bulletin of Pure and Applied Sciences, Vol. 16 E(No.2), 1997; p. 225-226.

%H F. Smarandache, <a href="http://www.gallup.unm.edu/~smarandache/CP2.pdf">Collected papers, Vol. II</a>, University of Kishinev, 1997.

%p P:=proc(i) local a,n; a:=3; print(a); for n from 3 by 1 to i do a:=ithprime(n)*10^floor(evalf(1+log10(a),100))+a; print(a); od; end: P(100); # _Paolo P. Lava_, Nov 14 2008

%o (PARI) a(n)={fromdigits(concat([digits(k) | k<-Vecrev(primes(n+1))[1..n]]))} \\ _Andrew Howroyd_, Feb 12 2020

%Y Primes in A092448 and their corresponding starting value in A100003. [_Dmitry Kamenetsky_, Mar 02 2009]

%Y Cf. A065091 (odd primes).

%K nonn,base

%O 1,1

%A Micha Fleuren (michafleuren(AT)hotmail.com), Mar 24 2004

%E More terms from _Ray Chandler_, Mar 28 2004

%E Offset corrected by _Michel Marcus_, Aug 15 2017

%E Terms a(14) and beyond from _Andrew Howroyd_, Feb 12 2020

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Last modified August 3 21:13 EDT 2021. Contains 346441 sequences. (Running on oeis4.)