id:A086354 - OEIS Search Results

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Fixed point if [nonzero-digit product]-function at initial-value=2^n is iterated.

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2

2, 4, 8, 6, 6, 8, 6, 6, 1, 8, 8, 2, 6, 2, 2, 4, 8, 2, 1, 6, 2, 2, 6, 8, 2, 8, 2, 8, 2, 2, 8, 6, 6, 2, 2, 6, 2, 2, 6, 8, 8, 6, 3, 4, 2, 2, 6, 6, 2, 8, 6, 2, 2, 9, 8, 6, 6, 5, 8, 2, 8, 8, 2, 6, 2, 8, 8, 8, 5, 8, 8, 8, 2, 8, 6, 4, 8, 6, 2, 7, 1, 8, 8, 4, 2, 8, 8, 6, 2, 8, 6, 2, 8, 2, 8, 6, 6, 6, 8, 8, 6, 8, 2, 8, 1 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=A051802[2^n]=fixed-point of A051801[2^n]`
	EXAMPLE	`n=20, 2^20=1048576, iteration list={1048576,6720,84,32,6},` `a(10)=6.`
	MATHEMATICA	`prd[x_] := Apply[Times, DeleteCases[IntegerDigits[x], 0]] Table[FixedPoint[prd, 2^w], {w, 1, 128}]`
	CROSSREFS	`Cf. A051801, A051802, A086353-A086361, A029898, A010888.` `Sequence in context: A103546 A080868 A046260 this_sequence A014257 A138284 A022478` `Adjacent sequences: A086351 A086352 A086353 this_sequence A086355 A086356 A086357`
	KEYWORD	`base,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jul 21 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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