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A092447 Concatenate odd primes in decreasing order. 6
3, 53, 753, 11753, 1311753, 171311753, 19171311753, 2319171311753, 292319171311753, 31292319171311753, 3731292319171311753, 413731292319171311753, 43413731292319171311753, 4743413731292319171311753, 534743413731292319171311753, 59534743413731292319171311753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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.

MAPLE

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

PROG

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

CROSSREFS

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

Cf. A065091 (odd primes).

Sequence in context: A099665 A173802 A001279 * A167217 A203561 A333563

Adjacent sequences:  A092444 A092445 A092446 * A092448 A092449 A092450

KEYWORD

nonn,base

AUTHOR

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

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

STATUS

approved

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Last modified June 19 03:38 EDT 2021. Contains 345125 sequences. (Running on oeis4.)