id:A131955 - OEIS Search Results

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A131955

a(n) = sum of digits of (n!! + a(n-1)).

+0
5

1, 3, 6, 5, 2, 5, 2, 17, 17, 23, 14, 23, 23, 23, 23, 23, 41, 41, 41, 41, 41, 50, 41, 59, 68, 59, 68, 59, 68, 86, 86, 104, 95, 95, 104, 86, 104, 86, 122, 95, 104, 113, 149, 95, 140, 95, 131, 122, 149, 140, 140, 113, 185, 149, 185, 149, 176, 194, 176, 185, 194, 194, 203 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`a(4)=6+4!!=6+8=14 -> Sum_digits(14)=5`
	MAPLE	`P:=proc(n) local a, i, k, w; a:=0; for i from 1 by 1 to n do w:=0; k:=a+2^((1+2i-cos(iPi))/4)Pi^((cos(iPi)-1)/4)GAMMA(1+1/2i); while k>0 do w:=w+k-(trunc(k/10)*10); k:=trunc(k/10); od; a:=w; print(a); od; end: P(100);`
	CROSSREFS	`Cf. A055263, A131954.` `Sequence in context: A009782 A016615 A135097 this_sequence A019652 A099874 A011223` `Adjacent sequences: A131952 A131953 A131954 this_sequence A131956 A131957 A131958`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jul 31 2007`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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