cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

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

Views

Author

Zak Seidov, Nov 13 2006

Keywords

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

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
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