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Odd numbers k such that neither k nor k + 2 is a power of a prime.
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%I #12 Aug 28 2024 10:31:37

%S 33,55,63,75,85,91,93,115,117,133,141,143,145,153,159,175,183,185,187,

%T 201,203,205,207,213,215,217,219,235,245,247,253,259,265,273,285,295,

%U 297,299,301,303,319,321,323,325,327,333,339,355,363,369,375,385,391,393,403

%N Odd numbers k such that neither k nor k + 2 is a power of a prime.

%o (PARI) isok(n) = (n % 2) && (omega(n) != 1) && (omega(n+2) != 1); \\ _Michel Marcus_, Oct 02 2013

%K nonn

%O 1,1

%A _Clark Kimberling_

%E Corrected and extended by _David W. Wilson_, May 15 1997