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A121048 n + phi(n), for Euler totient function phi(n). 0
2, 3, 5, 6, 9, 8, 13, 12, 15, 14, 21, 16, 25, 20, 23, 24, 33, 24, 37, 28, 33, 32, 45, 32, 45, 38, 45, 40, 57, 38, 61, 48, 53, 50, 59, 48, 73, 56, 63, 56, 81, 54, 85, 64, 69, 68, 93, 64, 91, 70, 83, 76, 105, 72, 95, 80, 93, 86, 117, 76, 121, 92, 99, 96, 113, 86, 133, 100, 113 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = n + phi(n) = n + A000010(n).

MATHEMATICA

n + EulerPhi[n]

CROSSREFS

Cf. A000010, A000040, A050530, A051953, A068080.

Sequence in context: A073673 A179217 A118809 * A075389 A053784 A036697

Adjacent sequences:  A121045 A121046 A121047 * A121049 A121050 A121051

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 08 2006

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Last modified February 14 07:16 EST 2012. Contains 205588 sequences.