OFFSET
1
COMMENTS
LINKS
PROG
(PARI)
ps(n)=if(n<2, n, if(n%2, ps(n\2)+ps(n\2+1), 'x*ps(n\2)));
A305892(n) = (!isprime(n) && polisirreducible(ps(n))); \\ Antti Karttunen, Jun 16 2018, after Charles R Greathouse IV's Apr 07 2015 code for A186892.
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 16 2018
STATUS
approved