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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 (list; graph; refs; listen; history; text; internal format)
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, A092584-A092590.

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

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Last modified December 19 16:03 EST 2014. Contains 252236 sequences.