A359597 Indices k such that A358777(k) is odd, and k is not an odd semiprime.

1, 135, 189, 297, 315, 351, 375, 459, 495, 513, 525, 585, 621, 693, 735, 765, 783, 819, 825, 837, 855, 875, 975, 999, 1029, 1035, 1071, 1107, 1155, 1161, 1197, 1269, 1275, 1287, 1305, 1365, 1375, 1395, 1425, 1431, 1449, 1593, 1617, 1625, 1647, 1665, 1683, 1715, 1725, 1785, 1809, 1815, 1827, 1845, 1881

Offset: 1

Author

Antti Karttunen, Jan 09 2023

Keywords

• nonn

Comments

2025 = 3^4 * 5^2, 30375 = 3^5 * 5^3 and 455625 == 3^6 * 5^4 are the first terms with respectively 6, 8 and 10 prime factors (with multiplicity).

Crossrefs

Setwise difference A359596 \ A046315.

Odd terms of A065036 form a subset.

Cf. A353480, A359595, A359598.

Programs

PARI

isA359597(n) = ((!A353480(n)) && A359595(n));