A176096 - OEIS

A176096

Smallest prime p = p(n) containing exactly n strings "13" (n = 1, 2, ...).

13, 13313, 1313813, 131313113, 13131313133, 1131313131313, 131313131313139, 13131313131313913, 1313131311313131313, 113131313131313131313, 13131313131313133131313, 1313131131313131313131313

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

REFERENCES

E. I. Ignatjew, Mathematische Spielereien, Urania Verlag Leipzig/Jena/Berlin 1982

B. A. Kordemski: Koepfchen, Koepfchen! Mathematik zur Unterhaltung, Urania Verlag Leipzig/Jena/Berlin 1965

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

n = 1: prime(6) = 13 is 1st term of sequence

prime(12268) = 131303 > 21313 = prime(2392) > 13313 = prime(1581) = p(2), 2nd term of sequence

prime(857198) = 13131317 > 4131313 = prime(291796) > prime(102949) = 1341313 > 1313813 = prime() = p(3), 3rd term of sequence

n = 13: 131131313131313131313131313 a 27-digit prime is 13th term of sequence

CROSSREFS

A037053, A037055, A037057, A037059, A037063, A037067

Sequence in context: A068731 A189309 A203707 * A215685 A327585 A262810

Adjacent sequences: A176093 A176094 A176095 * A176097 A176098 A176099

KEYWORD

base,nonn

AUTHOR

Eva-Maria Zschorn (e-m.zschorn(AT)zaschendorf.km3.de), Apr 08 2010

STATUS

approved