The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A057955 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A057955

Number of prime factors of 6^n - 1 (counted with multiplicity).
(history; published version)

#25 by Charles R Greathouse IV at Thu Sep 08 08:45:02 EDT 2022

PROG

(MAGMAMagma) f:=func<n|&+[p[2]: p in Factorization(n)]>; [f(6^n - 1):n in [1..90]]; // Marius A. Burtea, Feb 02 2020

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#24 by Max Alekseyev at Fri Apr 29 15:57:17 EDT 2022

STATUS

editing

approved

#23 by Max Alekseyev at Fri Apr 29 15:57:14 EDT 2022

CROSSREFS

bigomega(b^n-1): A057951 (b=10), A057952 (b=9), A057953 (b=8), A057954 (b=7), this sequence (b=6), A057956 (b=5), A057957 (b=4), A057958 (b=3), A046051 (b=2).

Cf. A057951-A057958, A046051, A001222, A024062, A085031, A274907.

STATUS

approved

editing

#22 by Max Alekseyev at Thu Apr 28 20:47:13 EDT 2022

STATUS

editing

approved

#21 by Max Alekseyev at Thu Apr 28 20:47:10 EDT 2022

CROSSREFS

Cf. A057951-A057958, A046051, A001222, A024062, A085031, A274907.

Cf. A001222, A024062, A085031.

STATUS

approved

editing

#20 by Michel Marcus at Mon Feb 03 03:51:02 EST 2020

STATUS

reviewed

approved

#19 by Joerg Arndt at Mon Feb 03 01:44:59 EST 2020

STATUS

proposed

reviewed

#18 by Bernard Schott at Sun Feb 02 13:38:20 EST 2020

STATUS

editing

proposed

#17 by Bernard Schott at Sun Feb 02 13:37:45 EST 2020

EXAMPLE

6^10 - 1 = 60466175 = 5^2 * 7 * 11 * 101 * 311 and a(10) = bigomega( 60466175) = 2+1+1+1+1 = 6. - Bernard Schott, Feb 02 2020

STATUS

proposed

editing

#16 by Bernard Schott at Sun Feb 02 13:36:12 EST 2020

STATUS

editing

proposed