1,1

If m & n are in the sequence, k<10 and r=m*n*10^k -1 is prime then r has

at least k+1 representations of the form p*q-(p+q)where p & q are prime.

Table of n, a(n) for n=1..15.

Carlos Rivera, Two Bergot questions

Cf. A153431, A153433.

Sequence in context: A186094 A023050 A233704 * A349324 A022241 A186016

Adjacent sequences: A153429 A153430 A153431 * A153433 A153434 A153435

nonn

Farideh Firoozbakht, Mar 31 2009

approved