id:A131839 - OEIS Search Results

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Additive persistence of Sierpinski numbers of first kind.

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

	OFFSET	`1,3`
	EXAMPLE	`Sierpinski number 257 --> 2+5+7=14 --> 1+4=5 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:=i^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. A014566, A131836.` `Sequence in context: A076221 A029235 A106696 this_sequence A143299 A076984 A079085` `Adjacent sequences: A131836 A131837 A131838 this_sequence A131840 A131841 A131842`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jul 20 2007`

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

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