A076086 a(1) = 1; a(n) is the smallest multiple of a(n-1) not divisible by 10 which is greater than the digit reversal of a(n-1). In case R(a(n-1)) < a(n-1) then a(n) = 2*a(n-1).

1, 2, 4, 8, 16, 64, 128, 896, 1792, 3584, 7168, 14336, 86016, 172032, 344064, 688128, 1376256, 8257536, 16515072, 33030144, 66060288, 132120576, 792723456, 1585446912, 3170893824, 6341787648, 12683575296, 76101451776, 152202903552

Offset

1,2

Links

Table of n, a(n) for n=1..29.

Example

a(4) = 16 hence a(5) =64 = 4*16 >61. But 64 is > 46 hence a(6) = 2*64 = 128.

Crossrefs

Sequence in context: A018754 A264980 A318151 * A246907 A074700 A230863

Adjacent sequences: A076083 A076084 A076085 * A076087 A076088 A076089

Keyword

base,nonn

Author

Amarnath Murthy, Oct 07 2002

Extensions

More terms from David Wasserman, Mar 25 2005

Status

approved