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A322676
Numbers k > 0 such that k has more divisors d, such that d-1 is prime, than any other smaller positive number, with a(1) = 1.
1
1, 3, 6, 12, 24, 48, 72, 120, 168, 240, 360, 720, 1440, 2160, 2520, 4320, 5040, 7560, 10080, 15120, 20160, 27720, 30240, 55440, 75600, 83160, 110880, 151200, 166320, 332640, 665280, 831600, 1330560, 1441440, 1663200, 2162160, 2882880, 3326400, 4324320, 6486480, 8648640
OFFSET
1,2
COMMENTS
Position of records in A072627.
PROG
(PARI) r=-1; for(n=1, 10^6, t=sumdiv(n, d, isprime(d-1)); if(t>r, r=t; print1(n, ", ")));
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Suteu, Dec 23 2018
STATUS
approved