

A092591


Exponents at which 1+A063395[2^n] is a power of 2.


0



1, 2, 3, 4, 6, 7, 12, 15, 16, 18, 30, 31, 60, 88, 106, 126
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OFFSET

1,2


COMMENTS

Numbers n such that A065395[n]=sigma[phi[n]]phi[sigma[n]].


LINKS

Table of n, a(n) for n=1..16.


EXAMPLE

At exponents n=1, 3, 7, 15, 31: A065395[2^n]+1=2, while at n=2, 4, 6, 12, 16, 18, 30, 60, 88, 106, 126: A065395[2^n]+1=2^n


CROSSREFS

Cf. A000203, A000010, A065395, A092584A092590.
Sequence in context: A018534 A018276 A057732 * A039947 A096477 A039059
Adjacent sequences: A092588 A092589 A092590 * A092592 A092593 A092594


KEYWORD

nonn


AUTHOR

Labos Elemer, Mar 03 2004


STATUS

approved



