A092447 Concatenate odd primes in decreasing order.

3, 53, 753, 11753, 1311753, 171311753, 19171311753, 2319171311753, 292319171311753, 31292319171311753, 3731292319171311753, 413731292319171311753, 43413731292319171311753, 4743413731292319171311753, 534743413731292319171311753, 59534743413731292319171311753

Offset: 1

Author

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

Keywords

• nonn
• base

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..100
• M. Fleuren, Smarandache Back Concatenated Odd Primes
• H. Marimutha, Smarandache Concatenated Type Sequences, Bulletin of Pure and Applied Sciences, Vol. 16 E(No.2), 1997; p. 225-226.
• F. Smarandache, Collected papers, Vol. II, University of Kishinev, 1997.

Crossrefs

Primes in A092448 and their corresponding starting value in A100003. [Dmitry Kamenetsky, Mar 02 2009]

Cf. A065091 (odd primes).

Programs

Mathematica

Table[FromDigits[Flatten[IntegerDigits/@Reverse[Prime[Range[2,n]]]]],{n,2,21}] (* Harvey P. Dale, Mar 01 2023 *)

PARI

a(n)={fromdigits(concat([digits(k) | k<-Vecrev(primes(n+1))[1..n]]))} \\ Andrew Howroyd, Feb 12 2020

Extensions

More terms from Ray Chandler, Mar 28 2004

Offset corrected by Michel Marcus, Aug 15 2017

Terms a(14) and beyond from Andrew Howroyd, Feb 12 2020