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A072459 Largest prime divisor of even nontotients. 0
7, 13, 17, 19, 5, 31, 17, 37, 19, 43, 5, 47, 7, 19, 59, 61, 31, 67, 71, 73, 19, 11, 79, 17, 29, 13, 31, 47, 97, 101, 103, 107, 109, 23, 13, 59, 11, 61, 41, 31, 127, 43, 19, 137, 139, 71, 13, 29, 149, 151, 19, 11, 157, 53, 23, 163, 167, 13, 17, 7, 59, 181, 13, 37, 17, 47 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..66.

FORMULA

a(n)=A006530(A005277(n)).

EXAMPLE

12th even nontotient is 94=2*47, so a(12)=47.

CROSSREFS

Cf. A006530, A005277.

Sequence in context: A102797 A233062 A205686 * A158813 A144426 A233518

Adjacent sequences:  A072456 A072457 A072458 * A072460 A072461 A072462

KEYWORD

nonn

AUTHOR

Labos Elemer, Jun 19 2002

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)