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A064992 usigma(n+1) - usigma(n), where usigma(n) is the sum of unitary divisors of n (A034448). +0
2
2, 1, 1, 1, 6, -4, 1, 1, 8, -6, 8, -6, 10, 0, -7, 1, 12, -10, 10, 2, 4, -12, 12, -10, 16, -14, 12, -10, 42, -40, 1, 15, 6, -6, 2, -12, 22, -4, -2, -12, 54, -52, 16, 0, 12, -24, 20, -18, 28, -6, -2, -16, 30, -12, 0, 8, 10, -30, 60, -58, 34, -16, -15, 19, 60, -76, 22, 6, 48, -72, 18, -16, 40 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Sequence in context: A112624 A139329 A069777 this_sequence A089759 A088152 A049270

Adjacent sequences: A064989 A064990 A064991 this_sequence A064993 A064994 A064995

KEYWORD

sign

AUTHOR

njas, Oct 31 2001

page 1

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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