Complement · 23 sequences
The sequences of the family “complement”, by A-number, with the share of their decomposable terms in the level class (k > L).
- primes · 1717
- polynomial · 1232
- quadratic form · 430
- prime values · 423
- residue class · 357
- digit rule · 306
- multiplicative · 199
- Beatty · 86
- divisor functions · 58
- binary rule · 48
- self-referential · 35
- complement · 23
- powers · 22
- summatory · 21
- arithmetic progression · 10
- smooth · 10
- forced divisor · 9
- sieve · 8
- block · 5
- base case · 1
| A-number | Name | Level |
|---|---|---|
| A000037 | Numbers that are not squares (or, the nonsquares) | 9.6 % |
| A001690 | Non-Fibonacci numbers | 9.6 % |
| A002808 | The composite numbers: numbers n of the form x*y for x > 1 and y > 1 | 10.6 % |
| A005381 | Numbers k such that k and k-1 are composite | 2.5 % |
| A007412 | The noncubes: a(n) = n + floor((n + floor(n^(1/3)))^(1/3)) | 9.6 % |
| A014076 | Odd nonprimes | 21.0 % |
| A014132 | Complement of triangular numbers (A000217); also array T(n,k) = ((n+k)^2 + n-k)/2, n, k > 0, read by antidiagonals | 9.5 % |
| A018825 | Numbers that are not the sum of 2 nonzero squares | 13.5 % |
| A022449 | c(p(n)) where p(k) is k-th prime including p(1)=1 and c(k) is k-th composite number | 24.6 % |
| A024619 | Numbers that are not powers of primes p^k (k >= 0); complement of A000961 | 10.6 % |
| A046953 | Numbers k such that 6*k - 1 is composite | 10.3 % |
| A047845 | a(n) = (m-1)/2, where m is the n-th odd nonprime (A014076(n)) | 9.8 % |
| A049068 | Complement of quarter-squares (A002620) | 9.6 % |
| A050435 | a(n) = composite(composite(n)), where composite = A002808, composite numbers | 10.9 % |
| A061673 | Even numbers k such that k+1 and k-1 are both composite | 11.1 % |
| A067611 | Numbers of the form 6xy +- x +- y, where x, y are positive integers | 9.5 % |
| A068780 | Composite numbers n such that n+1 is also composite | 11.2 % |
| A077654 | Composites k such that 2k+1 is also composite | 10.8 % |
| A078358 | Non-oblong numbers: Complement of A002378 | 9.5 % |
| A091300 | Nonprimes of the form 6k + 1 | 32.4 % |
| A100959 | Non-semiprimes | 11.6 % |
| A153238 | Numbers k such that 2*k + 3 is composite | 11.5 % |
| A200995 | Numbers not expressible as a product of Lucas numbers | 9.4 % |