id:A062401 - OEIS Search Results

Search: id:A062401

Displaying 1-1 of 1 results found.

page 1

Phi(sigma(n)).

+0
27

1, 2, 2, 6, 2, 4, 4, 8, 12, 6, 4, 12, 6, 8, 8, 30, 6, 24, 8, 12, 16, 12, 8, 16, 30, 12, 16, 24, 8, 24, 16, 36, 16, 18, 16, 72, 18, 16, 24, 24, 12, 32, 20, 24, 24, 24, 16, 60, 36, 60, 24, 42, 18, 32, 24, 32, 32, 24, 16, 48, 30, 32, 48, 126, 24, 48, 32, 36, 32, 48, 24, 96, 36, 36, 60 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 14.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	FORMULA	`sigma[a(x)]=A062402(sigma[x]) or phi[A062402(x)]=a(phi[x]). - Labos E. (labos(AT)ana.sote.hu), Jul 22 2004`
	EXAMPLE	`a(9)=12 because sigma(9)=13 and phi(13)= 12.`
	PROGRAM	`(PARI) j(e)=eulerphi(sigma(n)); vector(150, n, j(e))`
	CROSSREFS	`Cf. A000203, A000010, A062402.` `Cf. A096852, A096857, A096994, A096995.` `Sequence in context: A068976 A124859 A021446 this_sequence A138949 A138951 A071796` `Adjacent sequences: A062398 A062399 A062400 this_sequence A062402 A062403 A062404`
	KEYWORD	`nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Jul 08 2001`

page 1

Search completed in 0.002 seconds

Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research