id:A113929 - OEIS Search Results

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Numbers n such that sigma(n) and phi(n) are both palindromes.

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1, 2, 3, 4, 5, 7, 2881, 15456, 20930, 26461, 26772, 43262, 135536, 271171, 2118161, 2362081, 2545951, 2779321, 4236322, 6354483 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`phi(n)=A000010(n) is the Euler totient function, while sigma(n)=A000203(n) is the sum of divisors of n`
	EXAMPLE	`sigma(2118161)=2122212 and phi(2118161)=2114112.`
	CROSSREFS	`Cf. A000010, A000203.` `Sequence in context: A029963 A028986 A063948 this_sequence A082351 A122319 A123714` `Adjacent sequences: A113926 A113927 A113928 this_sequence A113930 A113931 A113932`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 30 2006`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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