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A088639 Smallest prime beginning with at least n n's (in decimal notation). 3
2, 11, 223, 3331, 44449, 555557, 66666629, 777777701, 888888883, 99999999907, 1010101010101010101039, 11111111111111111111111, 12121212121212121212121223, 1313131313131313131313131301 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

M. F. Hasler, Table of n, a(n) for n=0,...,100.

PROG

(PARI) A088639(n)={ local(p=10^#Str(n), d=1); n*=(p^n-1)/(p-1); until( (d*=10)*(n+1)>p=nextprime(n*d), ); p} /* M. F. Hasler, Jan 13 2009 */

CROSSREFS

Cf. A088640. See A068120 for another version. See also A065584 - A065592.

Sequence in context: A283512 A214217 A042805 * A269710 A162385 A244012

Adjacent sequences:  A088636 A088637 A088638 * A088640 A088641 A088642

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Oct 27 2003

EXTENSIONS

More terms from Ray Chandler, Nov 01 2003

PARI code, b-file, more cross-references and initial term added by M. F. Hasler, Jan 13 2009

STATUS

approved

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Last modified November 12 16:45 EST 2019. Contains 329058 sequences. (Running on oeis4.)