A257478 Distance of positions of first and last occurrence of n in A256918.

1, 2, 6, 7, 1, 3, 1, 4, 10, 13, 1, 4, 1, 1, 1, 21, 1, 24, 1, 27, 1, 1, 1, 10, 1, 1, 26, 15, 1, 11, 1, 22, 1, 1, 1, 5, 1, 1, 1, 19, 1, 43, 1, 2, 1, 1, 1, 1, 1, 55, 1, 2, 1, 20, 1, 39, 1, 1, 1, 13, 1, 1, 32, 42, 1, 11, 1, 2, 1, 67, 1, 26

Offset

1,2

Comments

a(n) = A257475(n) - A257120(n).

Links

Table of n, a(n) for n=1..72.

Example

Let w(n) = A257218(n),
u(n) = A257120(n), xx'(n) = (w(u(n)),w(u(n)+1)),
v(n) = A257475(n), yy'(n) = (w(v(n)),w(v(n)+1)):
. ----+------+------+------++--------------+------------+---------+
.   n | a(n) | u(n) | v(n) ||       xx'(n) |     yy'(n) | ... gcd |
. ----+------+------+------++--------------+------------+---------+
.   1 |    1 |    1 |    2 ||     (1,   2) |   (2,   3) |       1 |
.   2 |    2 |    4 |    6 ||     (6,   4) |   (8,  10) |       2 |
.   3 |    6 |    3 |    9 ||     (3,   6) |  (15,   9) |       3 |
.   4 |    7 |    5 |   12 ||     (4,   8) |  (12,  16) |       4 |
.   5 |    1 |    7 |    8 ||    (10,   5) |   (5,  15) |       5 |
.   6 |    3 |   11 |   14 ||    (18,  12) |  (24,  30) |       6 |
.   7 |    1 |   29 |   30 ||    (70,   7) |   (7,  14) |       7 |
.   8 |    4 |   13 |   17 ||    (16,  24) |  (40,  32) |       8 |
.   9 |   10 |   10 |   20 ||     (9,  18) |  (36,  27) |       9 |
.  10 |   13 |   15 |   28 ||    (30,  20) |  (50,  70) |      10 |
.  11 |    1 |  122 |  123 ||   (660,  11) |  (11,  22) |      11 |
.  12 |    4 |   19 |   23 ||    (48,  36) |  (72,  60) |      12 |
.  13 |    1 |  200 |  201 ||  (1092,  13) |  (13,  26) |      13 |
.  14 |    1 |   31 |   32 ||    (14,  28) |  (28,  42) |      14 |
.  15 |    1 |   24 |   25 ||    (60,  45) |  (45,  75) |      15 |
.  16 |   21 |   18 |   39 ||    (32,  48) | (112,  64) |      16 |
.  17 |    1 |  299 |  300 ||  (2142,  17) |  (17,  34) |      17 |
.  18 |   24 |   22 |   46 ||    (54,  72) |  (90, 108) |      18 |
.  19 |    1 |  824 |  825 || (10260,  19) |  (19,  38) |      19 |
.  20 |   27 |   16 |   43 ||    (20,  40) |  (80, 100) |      20 |
.  21 |    1 |   33 |   34 ||    (42,  21) |  (21,  63) |      21 |
.  22 |    1 |  124 |  125 ||    (22,  44) |  (44,  66) |      22 |
.  23 |    1 |  945 |  946 || (12420,  23) |  (23,  46) |      23 |
.  24 |   10 |   41 |   51 ||    (96, 120) | (144, 168) |      24 |
.  25 |    1 |   26 |   27 ||    (75,  25) |  (25,  50) |      25 | .

Prog

(Haskell)
a257478 n = a257475 n - a257120 n

Crossrefs

Cf. A256918, A257120, A257475, A257218.

Sequence in context: A219195 A212223 A158915 * A243523 A011044 A131212

Adjacent sequences: A257475 A257476 A257477 * A257479 A257480 A257481

Keyword

nonn

Author

Reinhard Zumkeller, Apr 25 2015

Extensions

a(37)-a(72) from Hiroaki Yamanouchi, May 03 2015

Status

approved