The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A321519

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A321519

Let d(n,i), i = 1..k be the k divisors of n^2 + 1 (the number 1 is not counted). a(n) is the number of ordered pairs d(n,i) < d(n,j) such that gcd(d(n,i), d(n,j)) = 1.
(history; published version)

#22 by N. J. A. Sloane at Sun Dec 16 01:13:43 EST 2018

STATUS

proposed

approved

#21 by Jon E. Schoenfield at Sat Dec 15 21:58:03 EST 2018

STATUS

editing

proposed

#20 by Jon E. Schoenfield at Sat Dec 15 21:58:00 EST 2018

COMMENTS

+--------------+-------------------------+------------+

+--------------+-----------------------+------------+

| | number of occurrences | |

| a(n) | for n <= 10^5 | percentage |

+--------------+-------------------------+------------+

+--------------+-----------------------+------------+

| 0 | 6656 | 6.656% |

| 1 | 23255 | 23.255% |

| 6 | 31947 | 31.947% |

| 25 | 20461 | 20.461% |

| other values | 17681 | 17.681% |

+--------------+-------------------------+------------+

+--------------+-----------------------+------------+

STATUS

proposed

editing

#19 by Michel Marcus at Sat Dec 15 01:50:22 EST 2018

STATUS

editing

proposed

#18 by Michel Marcus at Sat Dec 15 01:50:18 EST 2018

COMMENTS

Terms only depends on prime signature of n^2+1. - David A. Corneth , , Nov 14 2018

STATUS

proposed

editing

#17 by Michel Marcus at Sat Dec 15 01:48:46 EST 2018

STATUS

editing

proposed

#16 by Michel Marcus at Sat Dec 15 01:48:36 EST 2018

COMMENTS

Terms only depends on prime signature of n^2+1. - David A. Corneth , Nov 14 2018

#15 by Michel Marcus at Sat Dec 15 01:48:04 EST 2018

COMMENTS

Terms only depends on prime signature. _- _David A. Corneth_ , Nov 14 2018.

STATUS

proposed

editing

#14 by Michel Lagneau at Sat Dec 15 01:46:02 EST 2018

STATUS

editing

proposed

#13 by Michel Lagneau at Sat Dec 15 01:45:40 EST 2018

COMMENTS

Terms only depends on prime signature. David A. Corneth , Nov 14 2018.