id:A135103 - OEIS Search Results

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Digital sum (base the n-th prime) of n^3.

+0
2

1, 4, 3, 4, 5, 12, 7, 26, 25, 20, 41, 36, 37, 56, 63, 40, 41, 72, 61, 90, 117, 118, 113, 96, 73, 76, 99, 116, 89, 120, 181, 138, 169, 112, 251, 156, 109, 116, 57, 188, 35, 108, 87, 128, 181, 118, 83, 258, 129, 284, 179, 188, 317, 214, 231, 338, 273, 442, 311, 400, 253 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=ds_prime(n)(n^3), where ds_prime(n)=digital sum base the n-th prime.` `a(n)=n^3-(prime(n)-1)*sum{k>0, floor(n^3/prime(n)^k)}.`
	EXAMPLE	`a(2)=ds_prime(2)(2^3)=ds_3(8)=2+2=4; a(6)=ds_prime(6)(6^3)=ds_13(216)=1+3+8=12.`
	CROSSREFS	`Cf. A000040, A007953, A054899, A075771, A131451, A133620, A133900, A134599.` `Adjacent sequences: A135100 A135101 A135102 this_sequence A135104 A135105 A135106` `Sequence in context: A109382 A090369 A132293 this_sequence A117893 A021701 A097511`
	KEYWORD	`nonn`
	AUTHOR	`Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Dec 24 2007`

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Last modified October 6 15:53 EDT 2008. Contains 144667 sequences.

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