OFFSET
1,2
EXAMPLE
8 is a member as 8, 8+4, 8+4+2 or 8+4+2+1 (8,12,14 and 15) all are composite.
PROG
(PARI) isok(n) = {d = divisors(n); p = 0; forstep (i=#d, 1, -1, p += d[i]; if (isprime(p), return (0)); ); return (1); } \\ Michel Marcus, Sep 17 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 03 2003
EXTENSIONS
More terms from David Wasserman, Jan 26 2005
STATUS
approved