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A077088 a(n)=Phi[Sigma[n]-Phi[n]=A000010[A051612[n]]. 0
0, 1, 1, 4, 1, 4, 1, 10, 6, 6, 1, 8, 1, 6, 8, 22, 1, 20, 1, 16, 8, 12, 1, 24, 10, 8, 10, 20, 1, 32, 1, 46, 12, 18, 8, 78, 1, 12, 16, 36, 1, 24, 1, 32, 18, 20, 1, 36, 8, 72, 16, 36, 1, 32, 16, 32, 20, 30, 1, 72, 1, 20, 32, 72, 12, 60, 1, 46, 24, 32, 1, 108, 1, 24, 24, 48, 12, 48, 1, 60 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

COMMENTS

See iteration in A077090-A077100.

EXAMPLE

a(p)=1 for p primes. otherwise a[n]=even.

CROSSREFS

Cf. A000010, A000203, A051612, A065387, A077090-A077100.

Sequence in context: A089655 A097936 A050338 * A156896 A002193 A020807

Adjacent sequences:  A077085 A077086 A077087 * A077089 A077090 A077091

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Nov 04 2002

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Last modified February 15 08:20 EST 2012. Contains 205729 sequences.