|
| |
|
|
A099654
|
|
a[n] is the number of n-subsets [n=1,2,...,10] of the 10 decimal digits from which no prime numbers can be constructed. See also A099653.
|
|
5
| |
|
|
5, 21, 24, 16, 6, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
FORMULA
| a[n]=C[6, n]+C[4, n] for n>1 Number of "antiprime-digit-subclasses". Subsets were selected from {0, 2, 4, 5, 6, 8} and {0, 3, 6, 9} digit collections.
|
|
|
EXAMPLE
| n=1: {0,2,4,6,8} represent the relevant 1-subsets so a[1]=5.
Total number of prime irrelevant subset-classes from the 1023 non-empty k-digit-subsets equals 5+21+24+16+6+1=73 = 1023 - 950. See also A099653.
The "antiprime n-digit-collections" are taken from {0,2,4,5,6,8} or {0,3,6,9}, of which only composites can be constructed.
|
|
|
CROSSREFS
| Cf. A099651, A099654, A099756.
Sequence in context: A043053 A004163 A113410 * A195959 A176300 A042319
Adjacent sequences: A099651 A099652 A099653 * A099655 A099656 A099657
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Nov 15 2004
|
| |
|
|
