3,1

Primes arising in A122280 as greatest common divisor.

Table of n, a(n) for n=3..94.

(PARI) {m=100; z=2*m; w=vectorsmall(z); b=1; a=2; w[b]=1; w[a]=1; stop=0; n=3; while(!stop&&n<=m, j=1; while(j<=z&&(w[j]==1||!isprime(p=gcd(a, j))), j++); if(j>z, stop=1, print1(p, ", "); a=j; w[a]=1; n++))}

Cf. A122280.

Sequence in context: A106482 A301805 A260236 * A215406 A231717 A253315

Adjacent sequences: A122459 A122460 A122461 * A122463 A122464 A122465

nonn

Klaus Brockhaus, Sep 09 2006

approved