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A281072 Smallest number k > 0 such that b - r is even or r = 0 for all b = 1..n, r == k mod b. 2
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 (list; graph; refs; listen; history; text; internal format)
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: A232091 A164798 A087554 * A226951 A251557 A231901

Adjacent sequences:  A281069 A281070 A281071 * A281073 A281074 A281075

KEYWORD

nonn,easy

AUTHOR

Martin Janecke, Jan 14 2017

STATUS

approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)