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 A157813 Denominators of fractions arranged in Cantor's ordering (1/1, 2/1, 1/2, 1/3, 3/1, 4/1, 3/2, 2/3, 1/4, 1/5, 5/1, 6/1, 5/2, ...) with equivalent fractions removed. 4
 1, 1, 2, 3, 1, 1, 2, 3, 4, 5, 1, 1, 2, 3, 4, 5, 6, 7, 5, 3, 1, 1, 2, 4, 5, 7, 8, 9, 7, 3, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 7, 5, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 11, 9, 5, 3, 1, 1, 2, 4, 7, 8, 11, 13, 14, 15, 13, 11, 9, 7, 5, 3, 1, 1, 2, 3, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS PROG (Python) from fractions import gcd for s in range(2, 100, 2): ..for i in range(1, s): ....if gcd(i, s - i) != 1: continue ....print(s - i) ..for i in range(s, 0, -1): ....if gcd(i, s + 1 - i) != 1: continue ....print(s + 1 - i) # Hiroaki Yamanouchi, Oct 06 2014 CROSSREFS Cf. A157807, numerators of fractions in same sequence. Cf. A038567. Sequence in context: A190593 A276336 A212811 * A111879 A193280 A114732 Adjacent sequences:  A157810 A157811 A157812 * A157814 A157815 A157816 KEYWORD nonn,frac AUTHOR Ron R. King, Mar 07 2009 EXTENSIONS a(58)-a(83) from Hiroaki Yamanouchi, Oct 06 2014 STATUS approved

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Last modified May 24 01:29 EDT 2019. Contains 323528 sequences. (Running on oeis4.)