OFFSET
1,2
COMMENTS
Numbers n such that n has more divisors d such that d+1 is prime than any smaller number.
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..100
PROG
(PARI) r=0; for(n=1, 1e8, t=sumdiv(n, d, isprime(d+1)); if(t>r, r=t; print1(n", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Charles R Greathouse IV, Dec 23 2011
STATUS
approved