A068103 Smallest prime starting with at least n 2s.
2, 2, 223, 2221, 22229, 2222203, 22222223, 22222223, 222222227, 22222222223, 22222222223, 2222222222243, 22222222222201, 22222222222229, 222222222222227, 222222222222222043, 222222222222222221
Offset: 0
Links
- M. F. Hasler, Table of n, a(n) for n = 0..500
Programs
-
PARI
A068103(n)={n=10^n\9*2;n>2&for(d=1,9e9,n*=10;for(t=1,10^d-1,ispseudoprime(n+t)&return(n+t)));2} \\ - M. F. Hasler, Oct 17 2012
Extensions
More terms from Sascha Kurz, Mar 19 2002
Corrected by Don Reble, Jan 17 2007