A080797 Starting with a(0)=5, a(n) = smallest squarefree number k such that, for all a(m) with m<n, k+a(m) is not squarefree.

5, 3, 13, 15, 85, 291, 545, 723, 1455, 2345, 3605, 3613, 3615, 8835, 17653, 27545, 79205, 130827, 231097, 239595, 273435, 426891, 564565, 654135, 785065, 2762427, 2820927, 3335045, 3369253, 6526885, 8098527, 16766835, 43558023, 46352705

Offset

0,1

Links

Table of n, a(n) for n=0..33.

Prog

(PARI) v=vector(60); v[1]=5; print1("5, "); for(n=2, 60, for(k=1, 10^15, if(issquarefree(k), s=0; for(l=1, n-1, if(issquarefree(k+v[l]), break); s=s+1)); if(s==n-1, print1(k", "); v[n]=k; break)))

Crossrefs

Cf. A077225.

Sequence in context: A349156 A372313 A206435 * A358440 A280818 A085910

Adjacent sequences: A080794 A080795 A080796 * A080798 A080799 A080800

Keyword

nonn

Author

Ralf Stephan, Mar 25 2003

Extensions

More terms from Sam Alexander, Dec 12 2003

Status

approved