1,2

Harvey P. Dale, Table of n, a(n) for n = 1..1000

6 is the first non-prime-power.

Since 6 = 2*3 and 3-2 = 1, then a(1) = 1.

Min[Differences[FactorInteger[#][[All, 1]]]]&/@ Select[Range[ 2, 150], !PrimePowerQ[ #]&] (* Harvey P. Dale, Jun 22 2021 *)

Sequence in context: A176249 A083722 A111426 * A212332 A131032 A130323

Adjacent sequences: A100573 A100574 A100575 * A100577 A100578 A100579

nonn

Leroy Quet, Jan 02 2005

More terms from Franklin T. Adams-Watters, Aug 29 2006

approved