A090520 Primes arising in A090519, or 0 if A090519(n)= 0.

5, 7, 43, 769, 1123, 52631, 1428571, 2127659, 14925373, 769230769, 5882352941, 6369426751, 588235294117, 319488817891, 9345794392523, 24449877750611, 662251655629139, 1293661060802069, 67114093959731543, 244498777506112469

Offset

1,1

Comments

Conjecture: No term is zero.

Links

Table of n, a(n) for n=1..20.

Prog

(PARI) A090520(n)={ local(p, tenn) ; p=2 ; tenn=10^n ; while(tenn/p>=2, if( isprime(floor(tenn/p)), return(floor(tenn/p)) ) ; p=nextprime(p+1) ; ) ; return(0) ; } { for(n=1, 40, print1(A090520(n), ", ") ; ) } - R. J. Mathar, Nov 19 2006

Crossrefs

Cf. A090517, A090518, A090519.

Sequence in context: A274907 A213175 A265786 * A066219 A278618 A174267

Adjacent sequences: A090517 A090518 A090519 * A090521 A090522 A090523

Keyword

base,nonn

Author

Amarnath Murthy, Dec 07 2003

Extensions

Corrected and extended by R. J. Mathar, Nov 19 2006

Status

approved