The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A336557 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A336557

Numbers k such that A336456(n) = Product_{p^e|n} A336456(p^e). Here each p^e is the maximal power of prime p that divides k, and A336456(n) = A335915(sigma(sigma(n))).
(history; published version)

#6 by Susanna Cuyler at Mon Jul 27 21:09:39 EDT 2020

STATUS

proposed

approved

#5 by Antti Karttunen at Mon Jul 27 16:57:50 EDT 2020

STATUS

editing

proposed

#4 by Antti Karttunen at Mon Jul 27 16:39:44 EDT 2020

COMMENTS

Numbers k at which points A336456 appears to be multiplicative.

LINKS

Antti Karttunen, <a href="/A336557/b336557.txt">Table of n, a(n) for n = 1..10000</a>

#3 by Antti Karttunen at Sun Jul 26 06:43:39 EDT 2020

CROSSREFS

Cf. also A336547 (seems to be a subsequence).

Union of A336547 and A336560.

#2 by Antti Karttunen at Sat Jul 25 14:55:04 EDT 2020

NAME

allocated for Antti KarttunenNumbers k such that A336456(n) = Product_{p^e|n} A336456(p^e). Here each p^e is the maximal power of prime p that divides k, and A336456(n) = A335915(sigma(sigma(n))).

DATA

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 27, 28, 29, 31, 32, 36, 37, 38, 39, 41, 43, 44, 45, 47, 48, 49, 50, 51, 53, 54, 56, 59, 60, 61, 62, 63, 64, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79, 80, 81, 83, 86, 87, 89, 92, 95, 96, 97, 99, 100, 101, 103, 104, 107, 108, 109, 111, 112

OFFSET

1,2

COMMENTS

Numbers k at which points A336456 appears to be multiplicative.

CROSSREFS

Cf. A335915, A336456.

Cf. A336556 (characteristic function), A336558 (complement).

Union of A000961 and A336559.

Cf. also A336547 (seems to be a subsequence).

KEYWORD

allocated

nonn

AUTHOR

Antti Karttunen, Jul 25 2020

STATUS

approved

editing

#1 by Antti Karttunen at Sat Jul 25 13:51:12 EDT 2020

NAME

allocated for Antti Karttunen

KEYWORD

allocated

STATUS

approved