1,1

If n=9, then n10n = 9109 (prime).

If n=113, then n10n = 11310113 (prime).

If n=219, then n10n = 21910219 (prime).

Sequence in context: A036303 A116455 A103753 this_sequence A069069 A031088 A020156

Adjacent sequences: A103962 A103963 A103964 this_sequence A103966 A103967 A103968

base,nonn

Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 30 2005