A087392 a(1) = 1, a(n) = smallest multiple of n beginning with the digit reversal of a(n-1).

1, 10, 12, 212, 2120, 2124, 42126, 621240, 421263, 3621240, 4212637, 73621248, 842126376, 67362124802, 2084212637610, 16736212480208, 802084212637617, 7167362124802086, 680208421263761709, 9071673621248020860

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Formula

a(n) = n*ceiling((1/n)*reverse(a(n-1))*10^f(n)) where f(n) starts out practically always 1 or 2 and reaches higher values extremely slowly. - Sam Alexander, Nov 15 2003

Example

a(6) = 2124; a(7) = 42126, which begins with the digit reversal of 2124.

Crossrefs

Sequence in context: A078217 A359356 A178639 * A255534 A262422 A248336

Adjacent sequences: A087389 A087390 A087391 * A087393 A087394 A087395

Keyword

base,nonn

Author

Amarnath Murthy, Sep 09 2003

Extensions

More terms from Sam Alexander, Nov 15 2003

Status

approved