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A357677
Powers of either 3 or 5 or 7 (and 0).
0
0, 1, 3, 5, 7, 9, 25, 27, 49, 81, 125, 243, 343, 625, 729, 2187, 2401, 3125, 6561, 15625, 16807, 19683, 59049, 78125, 117649, 177147, 390625, 531441, 823543, 1594323, 1953125, 4782969, 5764801, 9765625, 14348907, 40353607, 43046721, 48828125, 129140163
OFFSET
1,3
COMMENTS
Block groups in which copies of the superblock are stored, when the "sparse superblock feature" is enabled, in the ext2/ext3/ext4 filesystems. (That is, copies of the superblock are stored in every block group when the feature is disabled, or in block groups 0, 1, 3, 5, 7, 9, 25, ... when the feature is enabled.)
LINKS
The Linux Kernel documentation, The Second Extended Filesystem (ext2)
The Linux Kernel documentation, ext4 Data Structures and Algorithms
Unix.StackExchange, Superblock replicas in ext4
MATHEMATICA
With[{max = 1.3*10^8}, Sort @ Flatten @ Join[{0, 1}, Table[p^Range[1, Floor[Log[p, max]]], {p, {3, 5, 7}}]]] (* Amiram Eldar, Oct 09 2022 *)
CROSSREFS
Union of (0 and) A000244, A000351, A000420.
Sequence in context: A100028 A053681 A135773 * A262029 A259380 A131668
KEYWORD
nonn,easy
AUTHOR
Shreevatsa R, Oct 08 2022
STATUS
approved