This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A103443 Largest left-truncatable prime in base n (given in decimal). 6
 23, 4091, 7817, 4836525320399, 817337, 14005650767869, 1676456897, 357686312646216567629137, 2276005673, 13092430647736190817303130065827539, 812751503, 615419590422100474355767356763 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 LINKS I. O. Angell, and H. J. Godwin, On Truncatable Primes Math. Comput. 31, 265-267, 1977. (See also Sloane link below) Martin Renner, Table of n, a(n) for n = 3..53 (with some question marks). Corrected and expanded by Hans Havermann, Jan 25 2014. N. J. A. Sloane, The Angell-Godwin table of initial terms of A023107 and A103443 Eric Weisstein: Truncatable Prime. PROG (PARI) a(n)=my(v=primes(primepi(n-1)), u, t, b=1, best); while(#v, best=vecmax(v); b*=n; u=List(); for(i=1, #v, for(k=1, n-1, if(isprime(t=v[i]+k*b), listput(u, t)))); v=Vec(u)); best \\ Charles R Greathouse IV, Feb 05 2013 CROSSREFS Cf. A076623, A023107, A103463, A254755. Sequence in context: A222031 A233143 A134798 * A059000 A233235 A286706 Adjacent sequences:  A103440 A103441 A103442 * A103444 A103445 A103446 KEYWORD nonn,base AUTHOR Martin Renner, Mar 21 2005, Sep 24 2007, Apr 20 2008 EXTENSIONS Base-14 entry corrected by Hans Havermann, May 30 2011 Corresponding entry in a-file corrected by N. J. A. Sloane, Jun 02 2011 a-file corrected and expanded by Hans Havermann, Jan 25 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.