OFFSET
1,1
COMMENTS
a(4) (if it exists) > 10^11. - Hiroaki Yamanouchi, Sep 10 2014
a(4) (if it exists) > 10^13. - Giovanni Resta, Jul 13 2015
EXAMPLE
Number 3577 is in sequence because sigma(3577+5) - sigma(3577) = 7800 - 4218 = 3582 = 3577 + 5.
MATHEMATICA
Select[Range[285*10^4], DivisorSigma[1, #+5]-DivisorSigma[1, #]==#+5&] (* Harvey P. Dale, Jun 21 2024 *)
PROG
(Magma) [n:n in[1..10^7] | SumOfDivisors(n+5)-SumOfDivisors(n) eq n+5]
(PARI)
for(n=1, 10^7, if(sigma(n+5)-sigma(n)==n+5, print1(n, ", "))) \\ Derek Orr, Sep 05 2014
CROSSREFS
KEYWORD
nonn,bref,more
AUTHOR
Jaroslav Krizek, Sep 05 2014
STATUS
approved