1,1

Smaller of pair of n-digit primes with difference n.

Table of n, a(n) for n=1..45.

17 is in the sequence because (1) it is a 2-digit prime number, (2) the next 2-digit prime number is 19 and (3) 19-17=2.

1009 is in the sequence because (1) it is a 4-digit prime number, (2) the next 4-digit prime number is 1013 and (3) 1013-1009=4.

Cf. A117300.

Sequence in context: A104272 A214934 A233866 * A186782 A141176 A118839

Adjacent sequences: A117152 A117153 A117154 * A117156 A117157 A117158

base,nonn

Luc Stevens (lms022(AT)yahoo.com), Apr 21 2006

Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, May 16 2007

approved