id:A112722 - OEIS Search Results

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First n-digit number m such that sigma(m) is prime.

+0
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2, 16, 289, 1681, 10201, 146689, 1190281, 10374841, 103042801, 1023424081, 10009802401, 100019755081, 1000242014641, 10001235475729, 100001580006241, 1000017101564209, 10000044600049729, 100000569832596889 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Each term is of the form p^k where p is prime.`
	CROSSREFS	`Sequence in context: A055546 A009549 A009795 this_sequence A009250 A140051 A137729` `Adjacent sequences: A112719 A112720 A112721 this_sequence A112723 A112724 A112725`
	KEYWORD	`easy,nonn`
	AUTHOR	`Farideh Firoozbakht (mymontain(AT)yahoo.com), Oct 10 2005`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research