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A139320 If A139319(n) = the smallest value of the form n*k - 1, k = positive integer, that is coprime to all the previous terms of sequence A139319 and A139319(1)=1, then a(n) = k = (A139319(n)+1)/n. 2
2, 1, 1, 1, 4, 1, 2, 1, 2, 3, 4, 1 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

For A139319(10) we check: 10*1 - 1= 9, which is not coprime to A139319(4)=3. 10*2 - 1= 19, which is not coprime to A139319(5)=19. But 10*3 - 1 = 29, which is coprime to terms A139319(1) through A139319(9). So a(10) = 3.

CROSSREFS

Cf. A139318, A139319.

Sequence in context: A156141 A174555 A157113 * A174204 A118106 A143201

Adjacent sequences:  A139317 A139318 A139319 * A139321 A139322 A139323

KEYWORD

more,nonn

AUTHOR

Leroy Quet, Apr 13 2008

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.