id:A077650 - OEIS Search Results

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Initial digits of sigma[n], the sum of divisors of n.

+0
1

1, 3, 4, 7, 6, 1, 8, 1, 1, 1, 1, 2, 1, 2, 2, 3, 1, 3, 2, 4, 3, 3, 2, 6, 3, 4, 4, 5, 3, 7, 3, 6, 4, 5, 4, 9, 3, 6, 5, 9, 4, 9, 4, 8, 7, 7, 4, 1, 5, 9, 7, 9, 5, 1, 7, 1, 8, 9, 6, 1, 6, 9, 1, 1, 8, 1, 6, 1, 9, 1, 7, 1, 7, 1, 1, 1, 9, 1, 8, 1, 1, 1, 8, 2, 1, 1, 1, 1, 9, 2, 1, 1, 1, 1, 1, 2, 9, 1, 1, 2, 1, 2, 1, 2, 1 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a[n]=A000030[A000203(n)]`
	MATHEMATICA	`Table[First[IntegerDigits[DivisorSigma[1, w]]], {w, 1, 128}]`
	CROSSREFS	`Cf. A000030, A000203.` `Sequence in context: A082226 A010613 A134688 this_sequence A105853 A017665 A105852` `Adjacent sequences: A077647 A077648 A077649 this_sequence A077651 A077652 A077653`
	KEYWORD	`base,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 19 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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