OFFSET
1,1
COMMENTS
LINKS
Altug Alkan, Table of n, a(n) for n = 1..30000
EXAMPLE
a(5) = 19 because 5 divides sigma(19*5) = 120 and 19 is the least prime number with this property.
PROG
(PARI) a(n) = {my(p=2); while (sigma(p*n) % n != 0, p = nextprime(p+1)); p; } \\ David A. Corneth, Feb 05 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Altug Alkan, Feb 05 2017
STATUS
approved