A124946 n and n+9 are 9-almost primes.

268992, 338976, 516375, 675783, 922176, 984375, 1060695, 1107351, 1164375, 1216215, 1233216, 1361367, 1388736, 1458720, 1668672, 1843632, 1877175, 2018592, 2075463, 2317491, 2333520, 2395575, 2440935, 2457936, 2495367, 2499255, 2546775, 2559375, 2811744

Offset: 1

Author

Zak Seidov, Nov 13 2006

Keywords

• nonn

Comments

First term 268992 = A098515(9).

The first term not divisible by 9 is a(163) = 9384375. The first term not divisible by 3 is a(193) = 10504375. - Charles R Greathouse IV, Oct 11 2013

Examples

			268992=2^6*3^2*467, 268992+9=269001=3^8*41;
338976=2^5*3^2*11*107, 338976+9=338985=3^7*5*31.
		

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A098515, A124940, A124941, A124942, A124945.

Programs

PARI

isok(n) = (bigomega(n) == 9) && (bigomega(n+9) == 9); \\ Michel Marcus, Oct 11 2013

Extensions

More terms from Michel Marcus, Oct 11 2013