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A055033 usigma(usigma(n)), where usigma(n) is the sum of unitary divisors of n (A034448). 2
1, 4, 5, 6, 12, 20, 9, 10, 18, 30, 20, 30, 24, 36, 36, 18, 30, 72, 30, 72, 33, 50, 36, 50, 42, 96, 40, 54, 72, 90, 33, 48, 68, 84, 68, 78, 60, 120, 72, 84, 96, 132, 60, 120, 120, 90, 68, 90, 78, 168, 90, 144, 84, 160, 90, 90, 102, 180, 120, 216, 96 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A034448, A051027, A061765, A064012.

Sequence in context: A301289 A310571 A280382 * A089119 A063833 A260107

Adjacent sequences:  A055030 A055031 A055032 * A055034 A055035 A055036

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 30 2001

STATUS

approved

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Last modified February 21 21:59 EST 2020. Contains 332113 sequences. (Running on oeis4.)