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42
From OeisWiki
42 is an integer It is the fifth Catalan number, and the last one which is an integral multiple of the immediately preceding Catalan number (14, see A000108).
Contents
- 1 Membership in core sequences
- 2 Sequences pertaining to 42
- 3 Partitions of 42
- 4 Roots and powers of 42
- 5 Logarithms and 42nd powers
- 6 Values for number theoretic functions with 42 as an argument
- 7 Factorization of some small integers in a quadratic integer ring adjoining the square roots of −42, 42
- 8 Factorization of 42 in some quadratic integer rings
- 9 Representation of 42 in various bases
- 10 See also
Membership in core sequences
Even numbers | ..., 36, 38, 40, 42, 44, 46, 48, ... | A005843 |
Composite numbers | ..., 38, 39, 40, 42, 44, 45, 46, ... | A002808 |
Squarefree numbers | ..., 38, 39, 41, 42, 31, 33, 34, ... | A005117 |
Oblong numbers | ..., 12, 20, 30, 42, 56, 72, 90, ... | A002378 |
Catalan numbers | 1, 1, 2, 5, 14, 42, 132, 429, ... | A000108 |
Denominators of Bernoulli numbers |
1, 2, 6, 1, 30, 1, 42, 1, 30, 1, ... | A027642 |
Sequences pertaining to 42
Multiples of 42 | 0, 42, 84, 126, 168, 210, 252, 294, 336, 378, 420, 462, 504, ... | |
Divisors of 42 | 1, 2, 3, 6, 7, 14, 21, 42 | A018258 |
sequence starting at 84 | 84, 42, 21, 62, 31, 92, 46, 23, 68, 34, 17, 50, 25, 74, 37, 110, ... | A008898 |
Partitions of 42
There are 53174 partitions of 42.
The Goldbach representations of 42 are 5 + 37 = 11 + 31 = 13 + 29 = 19 + 23.
Roots and powers of 42
In the table below, irrational numbers are given truncated to eight decimal places.
TABLE GOES HERE
Logarithms and 42nd powers
REMARKS
TABLE
Values for number theoretic functions with 42 as an argument
TABLE GOES HERE
Factorization of some small integers in a quadratic integer ring adjoining the square roots of −42, 42
REMARKS
TABLE GOES HERE
REMARKS
Factorization of 42 in some quadratic integer rings
PLACEHOLDER
TABLE GOES HERE
Representation of 42 in various bases
Base | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
Representation | 101010 | 1120 | 222 | 132 | 110 | 60 | 52 | 46 | 42 | 39 | 36 | 33 | 30 | 2C | 2A | 28 | 26 | 24 | 22 |
REMARKS GO HERE
See also
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 |
30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 |
40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 |
1729 |