id:A069177 - OEIS Search Results

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Maximal power of 2 that divides Phi(n), or the size of thw Sylow 2-subgroup of the group of units mod n.

+0
3

1, 1, 2, 2, 4, 2, 2, 4, 2, 4, 2, 4, 4, 2, 8, 8, 16, 2, 2, 8, 4, 2, 2, 8, 4, 4, 2, 4, 4, 8, 2, 16, 4, 16, 8, 4, 4, 2, 8, 16, 8, 4, 2, 4, 8, 2, 2, 16, 2, 4, 32, 8, 4, 2, 8, 8, 4, 4, 2, 16, 4, 2, 4, 32, 16, 4, 2, 32, 4, 8, 2, 8, 8, 4, 8, 4, 4, 8, 2, 32, 2, 8, 2, 8, 64, 2, 8, 8, 8, 8, 8, 4, 4, 2, 8, 32 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n) = 2^A053574(n). Multiplicative with a(2^e) = 2^(e-1) and a(p^e) = power of 2 in prime factorization of p - 1 for an odd prime p. - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2002`
	CROSSREFS	`Cf. A000010.` `Cf. A053574, A023506.` `Sequence in context: A090047 A088200 A073103 this_sequence A077659 A087692 A093621` `Adjacent sequences: A069174 A069175 A069176 this_sequence A069178 A069179 A069180`
	KEYWORD	`nonn,mult`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), Apr 09 2002`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2002`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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