A281072 Smallest number k > 0 such that b - r is even or r = 0 for all b = 1..n, r == k mod b.

1, 2, 4, 4, 6, 6, 10, 10, 10, 10, 36, 36, 66, 66, 196, 196, 196, 196, 568, 568, 568, 568, 1008, 1008, 1288, 1288, 1288, 1288, 8398, 8398, 8730, 8730, 50688, 50688, 124738, 124738, 124738, 124738, 155296, 155296, 155296, 155296, 155296, 155296, 155296, 155296, 1784476, 1784476

Offset

1,2

Comments

a(n) is the smallest number for which A281071(a(n)) is greater than or equal to n.

Links

Martin Janecke, Table of n, a(n) for n = 1..88

Example

a(3) = 4 because
  1 mod 2 = 1 where r > 0 and 2 - 1 is odd;
  2 mod 3 = 2 where r > 0 and 3 - 2 is odd;
  3 mod 2 = 1 where r > 0 and 2 - 1 is odd;
  4 mod 1 = 0 where r = 0,
  4 mod 2 = 0 where r = 0,
  4 mod 3 = 1 where 3 - 1 is even.

Crossrefs

Cf. A281071.

Sequence in context: A364066 A164798 A087554 * A226951 A251557 A231901

Adjacent sequences: A281069 A281070 A281071 * A281073 A281074 A281075

Keyword

nonn,easy

Author

Martin Janecke, Jan 14 2017

Status

approved