id:A131841 - OEIS Search Results

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Additive persistence of Woodall numbers.

+0
2

0, 0, 1, 1, 2, 2, 2, 2, 2, 2, 3, 2, 2, 3, 3, 2, 2, 2, 3, 2, 2, 3, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3, 3, 3, 2, 3, 2, 2, 3, 3, 3, 3, 3, 4, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 2, 3, 3, 3, 3, 3, 3, 4, 3, 4, 2, 2, 3, 2, 2, 3, 4, 3, 2, 2, 3, 2, 2, 3, 2, 2, 2, 4, 3, 2, 3, 3, 3, 2, 2, 3, 2, 2, 3, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3 (list; graph; listen)

	OFFSET	`1,5`
	EXAMPLE	`Woodall number 159 --> 1+5+9=15 --> 1+5=6 thus persistence is 2`
	MAPLE	`P:=proc(n) local i, k, w, ok, cont; for i from 1 by 1 to n do w:=0; k:=i2^i-1; ok:=1; if k<10 then print(0); else cont:=1; while ok=1 do while k>0 do w:=w+(k-(trunc(k/10)10)); k:=trunc(k/10); od; if w<10 then ok:=0; print(cont); else cont:=cont+1; k:=w; w:=1; fi; od; fi; od; end: P(120);`
	CROSSREFS	`Cf. A003261, A131838.` `Sequence in context: A096917 A068049 A141256 this_sequence A122921 A108128 A081326` `Adjacent sequences: A131838 A131839 A131840 this_sequence A131842 A131843 A131844`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jul 20 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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