|
a(11)=110 from the basis {0 1 2 4 8 15 24 29 34 46 64}. a(12)<=138 from {0 1 2 4 19 30 37 42 50 58 64 74} or {0 1 2 7 12 22 37 40 54 63 67 71} or {0 2 4 18 26 34 49 54 55 61 64 74}, for example. a(13) <= 169 from {0 1 2 5 16 30 38 47 59 65 71 78 91} or {0 1 2 5 18 28 35 50 59 65 71 79 90}. a(14) <= 202 from {0 1 2 4 7 24 38 47 56 66 74 82 95 107}. a(15) <= 250 from {0 1 2 4 13 40 61 67 83 90 98 108 113 118 132}. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 17 2007
Contribution from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Aug 24 2009: (Start)
Lexicographically-first basis that yields a(n) for n=2..13:
a(2) = 1 from {0 1}
a(3) = 3 from {0 1 2}
a(4) = 6 from {0 1 2 4}
a(5) = 11 from {0 1 2 4 7}
a(6) = 19 from {0 1 2 4 7 12}
a(7) = 31 from {0 1 2 4 8 13 18}
a(8) = 43 from {0 1 2 4 8 14 19 24}
a(9) = 63 from {0 1 2 4 8 15 24 29 34}
a(10) = 80 from {0 1 2 4 8 15 24 29 34 46}
a(11) = 110 from {0 1 2 4 8 15 24 29 34 46 64}
a(12) = 138 from {0 1 2 4 19 30 37 42 50 58 64 74}
a(13) = 169 from {0 1 2 5 16 30 38 47 59 65 71 78 91}
(End)
| 