A377413 a(n) is the least term of A126684 of the form k*n with k > 0.

0, 1, 2, 21, 4, 5, 42, 21, 8, 81, 10, 341, 84, 65, 42, 1365, 16, 17, 162, 1045, 20, 21, 682, 69, 168, 325, 130, 81, 84, 261, 2730, 341, 32, 1089, 34, 1365, 324, 4181, 2090, 273, 40, 1025, 42, 5461, 1364, 5445, 138, 20821, 336, 1029, 650, 4437, 260, 5141, 162

Offset

0,3

Links

Rémy Sigrist, Table of n, a(n) for n = 0..10000

Rémy Sigrist, C++ program

Formula

a(n) = A377412(n)*n.

a(n) >= A300889(n) for any n > 0.

a(n) = n iff n belongs to A126684.

Example

The first terms, in decimal and in binary, are:
  n   a(n)  bin(a(n))
  --  ----  ---------
   0     0          0
   1     1          1
   2     2         10
   3    21      10101
   4     4        100
   5     5        101
   6    42     101010
   7    21      10101
   8     8       1000
   9    81    1010001
  10    10       1010
  11   341  101010101
  12    84    1010100

Prog

(C++) // See Links section.

Crossrefs

See A300889 for a similar sequence.

Cf. A126684, A377412.

Sequence in context: A331460 A303218 A162536 * A100980 A360980 A122509

Adjacent sequences: A377410 A377411 A377412 * A377414 A377415 A377416

Keyword

nonn,base,easy

Author

Rémy Sigrist, Oct 27 2024

Status

approved