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A124650 Number of n-digit numbers m such that m and m^10 are zeroless. 1
3, 14, 42, 141, 399, 1274, 4123, 12688 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

a(3)=2 because #{113, 118, 125, 142, 144, 166, 172, 176, 186, 187, 195, 228, 244, 263, 268, 296, 315, 334, 357, 367, 376, 383, 387, 388, 396, 426, 467, 527, 563, 573, 574, 662, 764, 773, 783, 788, 863, 883, 885, 892, 976, 992} = 42

Corresponding zeroless 10-th powers are:

{339456738992222314849,523383555379856794624,931322574615478515625,

... 318895612267497741289677389824,784328825964927423585898725376,

922819411957263335393616461824}.

CROSSREFS

Cf. A104264.

Sequence in context: A104905 A055650 A000550 * A063903 A115005 A058389

Adjacent sequences:  A124647 A124648 A124649 * A124651 A124652 A124653

KEYWORD

base,more,nonn

AUTHOR

Zak Seidov (zakseidov(AT)gmail.com), Dec 22 2006

EXTENSIONS

a(7)-a(8) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 17 2010

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Last modified February 16 11:30 EST 2012. Contains 205907 sequences.