|
| |
|
|
A085275
|
|
Sum of n-th composite number and its largest prime divisor.
|
|
0
| |
|
|
6, 9, 10, 12, 15, 15, 21, 20, 18, 21, 25, 28, 33, 27, 30, 39, 30, 35, 35, 34, 44, 51, 42, 39, 57, 52, 45, 49, 55, 50, 69, 51, 56, 55, 68, 65, 57, 66, 63, 76, 87, 65, 93, 70, 66, 78, 77, 85, 92, 77, 75, 111, 80, 95, 88, 91, 85, 84, 123, 91, 102, 129, 116, 99, 95, 104, 115, 124
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 4,1
|
|
|
EXAMPLE
| For 91=7*13 we have 91+13 = 104; for 92=2*2*23 we have 92+23 = 115.
|
|
|
PROG
| (PARI) cminusp3(n) = { for(x=2, n, forstep(p=x, 2, -1, if(isprime(p) & x%p==0 & isprime(x)==0, print1(x+p, ", "); break); ) ) }
|
|
|
CROSSREFS
| Cf. A085271, A085273.
Sequence in context: A036347 A129492 A053869 * A177201 A090466 A090428
Adjacent sequences: A085272 A085273 A085274 * A085276 A085277 A085278
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Aug 12 2003
|
| |
|
|
