OFFSET
1,2
COMMENTS
The subsequence of values which are themselves in A048995 begins: 1, 625. The subsequence of primes begins 5, 4001, 8291, 9209.
FORMULA
a(n) = SUM[i=1..n] A048995(i) = SUM[i=1..n] (numbers that are not the sum of the nontrivial factors, excluding 1 and i, of some natural number).
EXAMPLE
a(8) = 1 + 4 + 51 + 87 + 95 + 119 + 123 + 145 = 625 = 5^4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Nov 28 2010
STATUS
approved