id:A096843 - OEIS Search Results

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Primes of form -1+repdigit]. Primes whose sum of divisors is a decimal repdigit.

+0
3

3, 7, 43, 443, 887, 2221, 8887, 444443, 888887, 444444443, 888888887, 444444444443, 888888888887, 222222222222222221, 444444444444444444444444444443, 44444444444444444444444444444443 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`n=43:sigma[43]=44;`
	CROSSREFS	`Cf. A096503-A096508, A096841-A096846, A000203.` `Adjacent sequences: A096840 A096841 A096842 this_sequence A096844 A096845 A096846` `Sequence in context: A107636 A074268 A019026 this_sequence A050639 A019011 A036842`
	KEYWORD	`base,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jul 15 2004`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research