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A073411 cototient(x) - 1 where x are the odd semiprimes (i.e. x are odd terms in A001358). +0
1
2, 6, 8, 4, 12, 10, 14, 6, 18, 14, 20, 16, 24, 16, 20, 30, 18, 32, 22, 38, 26, 22, 10, 42, 44, 24, 48, 22, 32, 34, 54, 28, 12, 60, 62, 40, 26, 68, 34, 44, 28, 72, 46, 36, 74, 28, 50, 80, 30, 84, 32, 42, 56, 90, 46, 16, 98, 62, 34, 48, 102, 64, 104, 38, 108, 34, 110, 52, 70 (list; graph; listen)
OFFSET

1,1

COMMENT

If the Goldbach conjecture is true, all even numbers appear at least one time in the sequence since pq-phi(pq) -1 = p + q.

CROSSREFS

Cf. A051953.

Adjacent sequences: A073408 A073409 A073410 this_sequence A073412 A073413 A073414

Sequence in context: A048741 A115317 A117932 this_sequence A121862 A095677 A011045

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 23 2002

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.


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