A024628 Odd numbers k such that neither k nor k + 2 is a power of a prime.

33, 55, 63, 75, 85, 91, 93, 115, 117, 133, 141, 143, 145, 153, 159, 175, 183, 185, 187, 201, 203, 205, 207, 213, 215, 217, 219, 235, 245, 247, 253, 259, 265, 273, 285, 295, 297, 299, 301, 303, 319, 321, 323, 325, 327, 333, 339, 355, 363, 369, 375, 385, 391, 393, 403

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Prog

(PARI) isok(n) = (n % 2) && (omega(n) != 1) && (omega(n+2) != 1); \\ Michel Marcus, Oct 02 2013

Crossrefs

Sequence in context: A007373 A229254 A242957 * A061864 A075810 A132288

Adjacent sequences: A024625 A024626 A024627 * A024629 A024630 A024631

Keyword

nonn

Author

Clark Kimberling

Extensions

Corrected and extended by David W. Wilson, May 15 1997

Status

approved