OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
a(3) = 8 is a term because A000203(8) = 15 = 3*5 and 8+15+(3+5) = 31 is prime.
MAPLE
filter:= proc(n) local s; s:= numtheory:-sigma(n);
isprime(n + s + add(t[1]*t[2], t=ifactors(s)[2]))
end proc:
CROSSREFS
KEYWORD
nonn
AUTHOR
J. M. Bergot and Robert Israel, Apr 14 2021
STATUS
approved