The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A280815 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A280815

a(n) = A049502(cototient(n)).
(history; published version)

#5 by N. J. A. Sloane at Tue Jan 10 07:52:45 EST 2017

STATUS

proposed

approved

#4 by Indranil Ghosh at Sun Jan 08 13:32:45 EST 2017

STATUS

editing

proposed

#3 by Indranil Ghosh at Sun Jan 08 13:26:36 EST 2017

LINKS

Indranil Ghosh, <a href="/A280815/b280815.txt">Table of n, a(n) for n = 1..10000</a>

Indranil Ghosh, <a href="/A280815/a280815.txt">Python Program to generate the sequence</a>

CROSSREFS

Cf. A049501, A049502, A051953, A280726, A280799, A280800.

#2 by Indranil Ghosh at Sun Jan 08 13:23:26 EST 2017

NAME

allocated for Indranil Ghosh

a(n) = A049502(cototient(n)).

DATA

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 3, 0, 0, 1, 2, 2, 0, 0, 3, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 4, 0, 0, 2, 0, 1, 4, 0, 3, 1, 4, 0, 0, 0, 3, 2, 4, 1, 3, 0, 0, 2, 6, 0, 0, 4, 4, 0, 0, 0, 2, 2, 0, 1, 0, 3, 0, 0, 0, 3, 0, 0, 3, 0, 0, 1, 3, 0, 4, 0

OFFSET

1,30

COMMENTS

a(n) = major index (2nd definition) of cototient(n), where cototient(n) = n - phi(n).

FORMULA

a(n) = A049502(A051953(n)).

EXAMPLE

For n = 30, cototient(n) = 22 and major index (2nd definition) of 22 is 3. So, a(n) = 3.

CROSSREFS

Cf. A049501, A051953, A280726, A280799, A280800.

KEYWORD

allocated

nonn

AUTHOR

Indranil Ghosh, Jan 08 2017

STATUS

approved

editing

#1 by Indranil Ghosh at Sun Jan 08 13:23:26 EST 2017

NAME

allocated for Indranil Ghosh

KEYWORD

allocated

STATUS

approved