id:A116030 - OEIS Search Results

Search: id:A116030

Displaying 1-1 of 1 results found.

page 1

sigma(n) - phi(n) is a palindrome greater than 2.

+0
2

4, 8, 9, 18, 25, 27, 28, 57, 62, 72, 85, 123, 128, 176, 184, 189, 192, 218, 220, 234, 243, 246, 252, 256, 258, 259, 261, 278, 282, 306, 309, 316, 322, 332, 338, 339, 356, 375, 380, 388, 399, 403, 490, 495, 505, 512, 518, 544, 590, 597, 622, 632, 655, 662 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`When n is prime sigma(n)-phi(n) is 2, so that case is trivial.`
	EXAMPLE	`sigma(399) - phi(399) = 424.`
	CROSSREFS	`Cf. A115897, A116031.` `Sequence in context: A020145 A071592 A089765 this_sequence A116020 A064393 A035326` `Adjacent sequences: A116027 A116028 A116029 this_sequence A116031 A116032 A116033`
	KEYWORD	`nonn,base`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

page 1

Search completed in 0.002 seconds

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

AT&T Labs Research