my misunderstanding of the OEIS

[science_man_88]

I find things like:

Cf. A126044-A126059. and I can't understand this as I tested it and it didn't come out to the sequence shown so i have no idea.

[kar_bon]

A000043 is list of prime p with 2^p-1 prime (= Mersenne prime) is:

2, 3, 5, 7, 13, 17, 19, 31, 61, 89,...

A126048 is A000043 mod 8:
2 (2 mod 8), 3 (3 mod 8), 5 (5 mod 8), 7 (7 mod 8), 5 (13 mod 8), 1 (17 mod 8), 3 (19 mod 8), 7 (31 mod 8), 5 (61 mod 8),...

Others the same.

[science_man_88]

Originally Posted by kar_bon

A000043 is list of prime p with 2^p-1 prime (= Mersenne prime) is:

2, 3, 5, 7, 13, 17, 19, 31, 61, 89,...

A126048 is A000043 mod 8:
2 (2 mod 8), 3 (3 mod 8), 5 (5 mod 8), 7 (7 mod 8), 5 (13 mod 8), 1 (17 mod 8), 3 (19 mod 8), 7 (31 mod 8), 5 (61 mod 8),...

Others the same.

Cf. A126043-A126059. I don't see how this would describe what you listed.

[axn]

http://en.wikipedia.org/wiki/Cf.

[science_man_88]

Originally Posted by axn

http://en.wikipedia.org/wiki/Cf.

still don't completely understand but thanks for the link axn

[CRGreathouse]

I don't understand what you don't understand, sm. I composed a post to answer you but didn't post it because it essentially duplicated what kar_bon posted.

[science_man_88]

Originally Posted by CRGreathouse

I don't understand what you don't understand, sm. I composed a post to answer you but didn't post it because it essentially duplicated what kar_bon posted.

all I've got so far is confer AX-AY is in cross reference but have no idea at all what it means literally as kar_bon has basically told be a description of the series a cross-reference is in and nothing to help me figure it out.

[kar_bon]

Cf. A126044-A126059 means there are sequences which all related to each other only differing in small cases:

A126044: A000043 mod 4
A126045: A000043 mod 5
A126046: A000043 mod 6
...

[science_man_88]

Originally Posted by kar_bon

Cf. A126044-A126059 means there are sequences which all related to each other only differing in small cases:

A126044: A000043 mod 4
A126045: A000043 mod 5
A126046: A000043 mod 6
...

see now that makes a bit more sense to me but then why list Adjacent sequences: A126040 A126041 A126042 this_sequence A126044 A126045 A126046 when most should be covered that other way ? anyway I get it now by the sounds of it.

[CRGreathouse]

The adjacent sequences don't mean very much unless you were trying to look up the sequence by hand instead of with the nice search tool.

[CRGreathouse]

Originally Posted by kar_bon

Cf. A126044-A126059 means there are sequences which all related to each other only differing in small cases

More generally, cf. means "compare": it shows a list of sequences which are in some way similar to the current one. They may not be as close as in this case, where they're all the same sequence with different choices of parameters.