A058825 - OEIS

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A058825

Numbers which are both totients and cototients.

1

1, 2, 4, 6, 8, 12, 16, 18, 20, 22, 24, 28, 30, 32, 36, 40, 42, 44, 46, 48, 54, 56, 60, 64, 66, 70, 72, 78, 80, 82, 84, 88, 92, 96, 102, 104, 106, 108, 110, 112, 120, 126, 128, 132, 136, 138, 140, 144, 148, 150, 156, 160, 162, 164, 166, 168, 176, 178, 180, 184, 190

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..10000

FORMULA

Intersection(A002202, A051953).

EXAMPLE

24 is here because 24 = phi(72) = 44-phi(44) = 44-20 = cototient(44).

CROSSREFS

Cf. A000010, A051953, A005277, A005278, A002020, A058763.

Sequence in context: A338361 A090404 A015937 * A087086 A301587 A319796

Adjacent sequences: A058822 A058823 A058824 * A058826 A058827 A058828

KEYWORD

nonn

AUTHOR

Labos Elemer, Jan 04 2001

EXTENSIONS

Offset corrected by Donovan Johnson, Nov 17 2013

STATUS

approved