OFFSET
1,1
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..500
EXAMPLE
n = 65, sigma(65)+12 = 84+12 = 96 = sigma(65+12) = sigma(77).
n = 11009, sigma(11009)+12 = 11220+12 = 11232 = sigma(11009+12) = sigma(11021).
PROG
(PARI) isok(n) = !isprime(n) && ((sigma(n)+12) == sigma(n+12)); \\ Michel Marcus, Dec 18 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, May 23 2000
EXTENSIONS
More terms from Jud McCranie, May 24 2000
Three more terms from Michel Marcus, Dec 18 2013
STATUS
approved