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A073272 A000040(n+1) - A073271(n). 2
0, 1, 0, 3, -1, 3, -1, 0, 5, -3, 3, 3, -1, -1, 1, 5, -3, 3, 3, -3, 3, -1, -1, 5, 3, -1, 3, -1, -9, 11, -1, 5, -7, 9, -3, 1, 3, -1, 1, 5, -7, 9, -1, 3, -9, 1, 9, 3, -1, -1, 5, -7, 5, 1, 1, 5, -3, 3, 3, -7, -3, 11, 3, -1, -9, 9, -3, 9, -1, -1, -1, 3, 1, 3, -1, -1, 5, -3, -1, 9, -7, 9, -3, 3, -1 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

COMMENTS

Observation/conjecture: a(n)=0 iff A073271(n) in {3, 7, 23}.

EXAMPLE

A000040(11)*A000040(13)/A000040(12) = 31*41/37 = 1271/37 = 34*37+13, therefore A073271(11)=34; a(10) = A000040(12)-A073271(10) = 37-34 = +3.

CROSSREFS

Cf. A073274.

Sequence in context: A020815 A156872 A132301 * A175623 A121273 A063065

Adjacent sequences:  A073269 A073270 A073271 * A073273 A073274 A073275

KEYWORD

sign

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 22 2002

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Last modified February 14 04:48 EST 2012. Contains 205570 sequences.