1,2

a(2) and a(3) certified prime with Primo. a(4) is a probable prime.

a(2)=122 because 12200...(121 zeros)...000221 is prime.

Sequence in context: A099154 A158131 A004925 this_sequence A116216 A031700 A092775

Adjacent sequences: A070952 A070953 A070954 this_sequence A070956 A070957 A070958

base,more,nonn

Jason Earls (zevi_35711(AT)yahoo.com), May 25 2002