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 A104176 a(n) = bitwise OR of all terms of n-th row of Pascal's triangle. 1
 1, 1, 3, 3, 7, 15, 31, 55, 127, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, 126975, 262143, 524287, 1048575, 2097151, 4194303, 8388607, 16777215, 33554431, 67108863, 134217727, 268435455, 536870911, 1073741823, 2147483647 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Eric Weisstein's World of Mathematics, Pascal's Triangle FORMULA Most but not all terms are of the form 2^n - 1 for some integer n. In the first 1600 terms we have: repeated numbers: 1, 3, 127 and 274877906943. Numbers not of form 2^n -1: 55, 126975. EXAMPLE Row 0 = 1 = 1 Row 1 = 1 OR 1 = 1 Row 2 = 1 OR 2 OR 1 = 3 Row 3 = 1 OR 3 OR 3 OR 1 = 3 PROG (PARI) a(n) = {or = binomial (n, 0); for (i=1, n, or = bitor(or, binomial(n, i)); ); return (or); } \\ Michel Marcus, Jun 08 2013 CROSSREFS Sequence in context: A056420 A030069 A004043 * A032294 A146034 A032029 Adjacent sequences:  A104173 A104174 A104175 * A104177 A104178 A104179 KEYWORD nonn,base AUTHOR Andrew G. West (WestA(AT)wlu.edu), Mar 28 2005 EXTENSIONS Name changed by Franklin T. Adams-Watters, Mar 29 2014 STATUS approved

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Last modified November 16 12:40 EST 2018. Contains 317272 sequences. (Running on oeis4.)