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 A264662 Triangle read by rows: row n contains the first n primes in lexicographical order of their mirrored binary representation. 3
 2, 2, 3, 2, 5, 3, 2, 5, 3, 7, 2, 5, 3, 11, 7, 2, 5, 13, 3, 11, 7, 2, 17, 5, 13, 3, 11, 7, 2, 17, 5, 13, 3, 19, 11, 7, 2, 17, 5, 13, 3, 19, 11, 7, 23, 2, 17, 5, 13, 29, 3, 19, 11, 7, 23, 2, 17, 5, 13, 29, 3, 19, 11, 7, 23, 31, 2, 17, 5, 37, 13, 29, 3, 19, 11 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS T(n,A263856(n)) = A000040(n): A263856(n) = index of prime(n) in n-th row. LINKS Reinhard Zumkeller, Rows n = 1..250 of triangle, flattened EXAMPLE .   n |   T(n,k), k=1..n . ----+----------------------------------------------------------------- .   1 | 2                          01 .   2 | 2  3                       01 11 .   3 | 2  5  3                    01 101   11 .   4 | 2  5  3  7                 01 101   11   111 .   5 | 2  5  3 11  7              01 101   11   1101 111 .   6 | 2  5 13  3 11  7           01 101   1011 11   1101 111 .   7 | 2 17  5 13  3 11  7        01 10001 101  1011 11   1101  111 .   8 | 2 17  5 13  3 19 11  7     01 10001 101  1011 11   11001 1101 111 .   9 | 2 17  5 13  3 19 11  7 23 .  10 | 2 17  5 13 29  3 19 11  7 23 .  11 | 2 17  5 13 29  3 19 11  7 23 31 .  12 | 2 17  5 37 13 29  3 19 11  7 23 31 .  13 | 2 17 41  5 37 13 29  3 19 11  7 23 31 .  14 | 2 17 41  5 37 13 29  3 19 11 43 7  23 31 .  15 | 2 17 41  5 37 13 29  3 19 11 43  7 23 47 31 .  16 | 2 17 41  5 37 53 13 29  3 19 11 43  7 23 47 31 .  17 | 2 17 41  5 37 53 13 29  3 19 11 43 59  7 23 47 31 .  18 | 2 17 41  5 37 53 13 29 61  3 19 11 43 59  7 23 47 31 .  19 | 2 17 41  5 37 53 13 29 61  3 67 19 11 43 59  7 23 47 31 .  20 | 2 17 41  5 37 53 13 29 61  3 67 19 11 43 59  7 71 23 47 31 PROG (Haskell) import Data.List (inits, sortBy); import Data.Function (on) a264662 n k = a264662_tabl !! (n-1) !! (n-1) a264662_row n = a264662_tabl !! (n-1) a264662_tabl = map (sortBy (compare `on` (reverse . show . a007088))) \$                    tail \$ inits a000040_list CROSSREFS Cf. A263846, A000040, A007088, A007504 (row sums), A264666 (partial row products), A037126 (rows sorted naturally). Sequence in context: A076396 A076397 A254269 * A076403 A157987 A025478 Adjacent sequences:  A264659 A264660 A264661 * A264663 A264664 A264665 KEYWORD nonn,tabl AUTHOR Reinhard Zumkeller, Nov 20 2015 STATUS approved

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Last modified October 23 18:52 EDT 2018. Contains 316530 sequences. (Running on oeis4.)