A254003 For n>=1, let B_n(k) be the sequence defined by b(1)=1, b(2)=p_1, ..., b(n+2)=p_(n+1), thereafter (for k>=n+3) the smallest number not occurring earlier having at least one common factor with b(k-(n+1)), but none with b(k-1)*b(k-2)*...*b(k-n); a(n) is m such that B_n(m)=6.

10, 14, 83, 157, 1190, 206

Offset: 1

Author

Vladimir Shevelev and Peter J. C. Moses, Jan 22 2015

Keywords

• nonn
• more

Comments

In particular, A098550(10)=6, A247225(14)=6.

On the other hand, it seems likely that 6 never appears in A247665 (which has a different although related definition). - N. J. A. Sloane, Apr 26 2015

Crossrefs

Cf. A098550, A247225, A247665.