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 A191701 In base 2 lunar arithmetic, number of binary numbers x of length n such that x*x has no zeros. 1
 1, 1, 1, 1, 2, 3, 5, 9, 15, 28, 50, 95, 174, 337, 637, 1231, 2373, 4618, 8974, 17567, 34387, 67561, 132945, 262096, 517373, 1023366, 2025627, 4014861, 7964971, 15814414, 31424805, 62490481, 124330234, 247514283, 492990898, 982307460, 1958093809, 3904594162, 7788271542, 15539347702, 31012331211 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing] D. Applegate, M. LeBrun, N. J. A. Sloane, Dismal Arithmetic, J. Int. Seq. 14 (2011) # 11.9.8. EXAMPLE a(7)=5 since the following five vectors all have lunar squares equal to 1111111111111: 1101011, 1101111, 1110111, 1111011, 1111111. CROSSREFS Sequence in context: A060013 A092424 A167510 * A066726 A124642 A269153 Adjacent sequences:  A191698 A191699 A191700 * A191702 A191703 A191704 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Jun 12 2011, corrected Jun 13 2011 EXTENSIONS a(20) through a(41) from N. J. A. Sloane, Jun 14 2011 STATUS approved

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Last modified January 20 02:13 EST 2019. Contains 319320 sequences. (Running on oeis4.)