OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(10) = 10 + (sum of distinct primes dividing 20) = 10 + 2 + 5 = 17.
MATHEMATICA
nxt[{n_, a_}]:={n+1, n+1+Total[Transpose[FactorInteger[a]][[1]]]}; Join[{1}, Transpose[ NestList[nxt, {2, 2}, 70]][[2]]] (* Harvey P. Dale, Mar 11 2015 *)
PROG
(PARI) b=1; for(i=2, 100, v=factor(b); b=i+sum(j=1, matsize(v)[1], v[j, 1]); print1(b, ", ")) (Klasen)
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Nov 01 2005
EXTENSIONS
More terms from Lambert Klasen (lambert.klasen(AT)gmx.net), Nov 06 2005
STATUS
approved