The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A068956

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A068956

Number of distinct prime factors of n^n - (n-1)^(n-1).
(history; published version)

#24 by N. J. A. Sloane at Thu Feb 06 08:18:38 EST 2020

STATUS

reviewed

approved

#23 by Joerg Arndt at Thu Feb 06 07:53:11 EST 2020

STATUS

proposed

reviewed

#22 by Amiram Eldar at Thu Feb 06 05:08:48 EST 2020

STATUS

editing

proposed

#21 by Amiram Eldar at Thu Feb 06 04:33:48 EST 2020

NAME

Number of distinct prime factors of n^n - (n-1)^(n-1).

CROSSREFS

Cf. A001221, A007781, A068957.

#20 by Amiram Eldar at Thu Feb 06 04:32:25 EST 2020

DATA

1, 1, 1, 2, 2, 1, 3, 6, 3, 1, 3, 2, 3, 3, 2, 1, 2, 3, 3, 2, 2, 3, 3, 4, 7, 4, 2, 2, 5, 4, 5, 3, 6, 4, 4, 2, 4, 7, 6, 4, 3, 4, 7, 6, 2, 7, 4, 7, 10, 6, 4, 5, 5, 7, 7, 5, 5, 6, 2, 5, 8, 4, 6, 5, 5, 3, 5, 4, 4, 2, 3, 4, 8, 4, 6, 4, 5, 7, 5, 13, 8, 4, 2, 5, 6

EXTENSIONS

a(55)-a(86) from Amiram Eldar, Feb 06 2020

STATUS

approved

editing

#19 by Bruno Berselli at Sat May 13 03:44:06 EDT 2017

STATUS

reviewed

approved

#18 by Joerg Arndt at Sat May 13 02:27:22 EDT 2017

STATUS

proposed

reviewed

#17 by Alois P. Heinz at Fri May 12 17:23:08 EDT 2017

STATUS

editing

proposed

#16 by Alois P. Heinz at Fri May 12 17:22:38 EDT 2017

DATA

1, 1, 1, 2, 2, 1, 3, 6, 3, 1, 3, 2, 3, 3, 2, 1, 2, 3, 3, 2, 2, 3, 3, 4, 7, 4, 2, 2, 5, 4, 5, 3, 6, 4, 4, 2, 4, 7, 6, 4, 3, 4, 7, 6, 2, 7, 4, 7, 10, 6, 4, 5, 5

EXTENSIONS

a(53)-a(54) from Alois P. Heinz, May 12 2017

#15 by Alois P. Heinz at Fri May 12 16:13:47 EDT 2017

EXAMPLE

A007781(1413) = 10809131718965763 = 3 * 61^2 * 968299894201, therefore a(14) = 3.

Discussion

Fri May 12

16:15

Alois P. Heinz: micro-errors ...