OFFSET
1,1
COMMENTS
a(310) > 10^11. - Hiroaki Yamanouchi, Sep 11 2015
LINKS
Hiroaki Yamanouchi, Table of n, a(n) for n = 1..309
EXAMPLE
Number 831376 (with sigma(831376) = 1985984) is in sequence because sigma(831376+sigma(831376)) = sigma(2817360) = 11915904 = 6*1985984.
PROG
(Magma) [n:n in[1..10^7] | SumOfDivisors(n+SumOfDivisors(n))eq 6*SumOfDivisors(n)]
(PARI)
for(n=1, 10^7, if(sigma(n+sigma(n))==6*sigma(n), print1(n, ", "))) \\ Derek Orr, Sep 07 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Sep 07 2014
EXTENSIONS
a(5)-a(25) from Hiroaki Yamanouchi, Sep 11 2015
STATUS
approved