OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..500
EXAMPLE
1123 is in the sequence because the distinct prime divisors of 1123^2 + 1 are 2, 5, 13, 89, 109 and the sum 2 + 5 + 13 + 89 + 109 = 218 = 2*109.
MATHEMATICA
Select[Range[1700000], Plus@@(pl=First/@FactorInteger[#^2+1])==2*pl[[-1]]&]
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Nov 13 2011
STATUS
approved