A268332 Squarefree numbers differing by more than 3 from any other squarefree number.

2526, 44405, 47527, 47973, 55779, 72474, 101037, 106327, 106674, 109023, 110107, 133577, 153173, 165574, 183553, 186247, 193026, 196747, 208847, 209674, 212127, 218527, 220209, 234622, 237522, 245149, 261478, 266853, 269953, 308649, 328877, 334522, 342066, 364151, 370785, 375823

Offset: 1

Author

Christopher E. Thompson, Feb 01 2016

Keywords

• nonn

Links

• Christopher E. Thompson, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A005117, A073247, A268331, A268333, A268334.

Programs

Maple

SF:= select(numtheory:-issqrfree, [$1..10^6]):
SF[select(i -> SF[i]-SF[i-1]>=4  and SF[i+1]-SF[i]>=4, [$2..nops(SF)-1])]; # Robert Israel, Feb 02 2016