A074320 - OEIS

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A074320

Sum of smallest and largest prime factors of n.

2, 4, 6, 4, 10, 5, 14, 4, 6, 7, 22, 5, 26, 9, 8, 4, 34, 5, 38, 7, 10, 13, 46, 5, 10, 15, 6, 9, 58, 7, 62, 4, 14, 19, 12, 5, 74, 21, 16, 7, 82, 9, 86, 13, 8, 25, 94, 5, 14, 7, 20, 15, 106, 5, 16, 9, 22, 31, 118, 7, 122, 33, 10, 4, 18, 13, 134, 19, 26, 9, 142, 5, 146, 39, 8, 21, 18, 15 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	FORMULA	`a(n) = A020639(n) + A006530(n).`
	MATHEMATICA	`f[n_]:=Transpose[FactorInteger[n]][[1]]; Table[First[f[n]]+Last[f[n]], {n, 200}] (From Vladimir Joseph Stephan Orlovsky, Apr 8 2011)`
	CROSSREFS	`Cf. A046665, A066048, A130064, A130065.` `Sequence in context: A107701 A011176 A154542 * A014428 A180935 A151886` `Adjacent sequences: A074317 A074318 A074319 * A074321 A074322 A074323`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Sep 26 2002`

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Last modified February 17 07:30 EST 2012. Contains 205998 sequences.