A202727 Position of records in A067513.

1, 2, 4, 12, 36, 60, 120, 180, 360, 540, 720, 1080, 1260, 1680, 2160, 2520, 3780, 5040, 7560, 10080, 15120, 25200, 30240, 45360, 55440, 60480, 75600, 85680, 100800, 110880, 131040, 166320, 196560, 257040, 332640, 393120, 514080, 655200, 665280, 786240, 831600

Offset: 1

Author

Charles R Greathouse IV, Dec 23 2011

Keywords

• nonn

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

Crossrefs

Cf. A067513, A202728.

Programs

PARI

r=0;for(n=1,1e8,t=sumdiv(n,d,isprime(d+1));if(t>r,r=t;print1(n", ")))