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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; text; internal format)
OFFSET
4,1
LINKS
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
Sequence in context: A129492 A241913 A053869 * A177201 A090466 A090428
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Aug 12 2003
STATUS
approved

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Last modified April 16 10:45 EDT 2024. Contains 371709 sequences. (Running on oeis4.)