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

0,1

Links

M. F. Hasler, Table of n, a(n) for n = 0..500

Prog

(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

Crossrefs

Cf. A065585, A065584, A068104, A068105.

Sequence in context: A216481 A078241 A216812 * A335257 A119512 A350028

Adjacent sequences: A068100 A068101 A068102 * A068104 A068105 A068106

Keyword

base,nonn

Author

Amarnath Murthy, Feb 20 2002

Extensions

More terms from Sascha Kurz, Mar 19 2002

Corrected by Don Reble, Jan 17 2007

Status

approved