id:A066308 - OEIS Search Results

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Sum of digits times product of digits of n.

+0
1

1, 4, 9, 16, 25, 36, 49, 64, 81, 0, 2, 6, 12, 20, 30, 42, 56, 72, 90, 0, 6, 16, 30, 48, 70, 96, 126, 160, 198, 0, 12, 30, 54, 84, 120, 162, 210, 264, 324, 0, 20, 48, 84, 128, 180, 240, 308, 384, 468, 0, 30, 70, 120, 180, 250, 330, 420, 520, 630, 0, 42, 96, 162, 240, 330 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`n=12, a[n]=(1+2).1.2=6<n n=19 a[n]=(1+9).1.9=90>n n=135 a[n]=(1+3+5).1.3.5=135=n`
	MATHEMATICA	`asum[x_] := Apply[Plus, IntegerDigits[x]] apro[x_] := Apply[Times, IntegerDigits[x]] a[n]=asum[n]*apro[n]`
	CROSSREFS	`Cf. A038369, A049101-A049106, A034710, A061672, A066306, A066307.` `Sequence in context: A111707 A115300 A085942 this_sequence A063462 A098736 A002015` `Adjacent sequences: A066305 A066306 A066307 this_sequence A066309 A066310 A066311`
	KEYWORD	`base,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 13 2001`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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