OFFSET
1,1
COMMENTS
FORMULA
a(n) = C(n) + smallest prime divisor of C(n).
EXAMPLE
C(4) = 9 and C(5) = 10 hence a(4) = a(5) = 12.
For 91=7*13 we have 91+7 = 98; for 92=2*2*23 we have 92-2 = 94
PROG
(PARI) cminusp31(n) = \sum c+min prime div { for(x=2, n, forprime(p=2, floor(sqrt(x)), if(x%p==0 & isprime(x)==0, print1(x+p, ", "); break); ) ) }
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Jan 31 2003
EXTENSIONS
More terms from Cino Hilliard, Aug 12 2003
STATUS
approved