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

1,2

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).

Links

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

Prog

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

Crossrefs

Setwise difference A359596 \ A046315.

Odd terms of A065036 form a subset.

Cf. A353480, A359595, A359598.

Sequence in context: A096593 A050215 A358778 * A218417 A348696 A274434

Adjacent sequences: A359594 A359595 A359596 * A359598 A359599 A359600

Keyword

nonn

Author

Antti Karttunen, Jan 09 2023

Status

approved