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 A275487 Number of weird numbers (A006037) less than 2^n. 1
 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 6, 25, 66, 134, 266, 505, 952, 1850, 3515, 6643, 12920, 26893, 55786, 114992, 234719, 473299, 946406, 1884728, 3754316, 7467998, 14845968, 29628007, 59231668, 118528637 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,11 COMMENTS It is known that the density of weird numbers is positive, but smaller than 0.0101. The three smallest weird numbers are 70, 836 and 4030, therefore a(n) = 0 for n < 7; a(n) = 1 for 7 <= n < 10, and a(n) = 2 for 10 <= n < 12. LINKS Table of n, a(n) for n=0..36. PROG (PARI) print1(s=0); for(k=0, 30, print1(", "s+=sum(n=1<

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Last modified May 25 11:12 EDT 2024. Contains 372788 sequences. (Running on oeis4.)