The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A322676 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

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.
(history; published version)

#17 by Alois P. Heinz at Fri Jan 11 17:50:34 EST 2019

STATUS

reviewed

approved

#16 by Michel Marcus at Mon Jan 07 13:14:36 EST 2019

STATUS

proposed

reviewed

#15 by Daniel Suteu at Thu Dec 27 15:41:48 EST 2018

STATUS

editing

proposed

#14 by Daniel Suteu at Thu Dec 27 15:41:45 EST 2018

NAME

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.

STATUS

proposed

editing

#13 by Daniel Suteu at Thu Dec 27 13:38:10 EST 2018

STATUS

editing

proposed

#12 by Daniel Suteu at Thu Dec 27 13:28:46 EST 2018

NAME

Numbers k > 0 such that k has more divisors d, such that d-1 is prime, than any other smaller number, with a(1) = 1.

DATA

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

1,12

COMMENTS

Position of positive records in A072627.

PROG

(PARI) r=0-1; for(n=1, 10^6, t=sumdiv(n, d, isprime(d-1)); if(t>r, r=t; print1(n, ", ")));

STATUS

proposed

editing

#11 by Daniel Suteu at Sun Dec 23 11:30:11 EST 2018

STATUS

editing

proposed

#10 by Daniel Suteu at Sun Dec 23 11:30:09 EST 2018

COMMENTS

Position of positive records in A072627.

STATUS

proposed

editing

#9 by Daniel Suteu at Sun Dec 23 09:11:05 EST 2018

STATUS

editing

proposed

#8 by Daniel Suteu at Sun Dec 23 09:11:02 EST 2018

PROG

(PARI) r=-10; for(n=1, 10^6, t=sumdiv(n, d, isprime(d-1)); if(t>r, r=t; print1(n, ", ")));

STATUS

proposed

editing