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

1,2

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

Cf. A067513, A202728.

Sequence in context: A211768 A112083 A089965 * A325255 A084716 A241208

Adjacent sequences: A202724 A202725 A202726 * A202728 A202729 A202730

Keyword

nonn

Author

Charles R Greathouse IV, Dec 23 2011

Status

approved