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#67 by Jon E. Schoenfield at Sun Oct 29 21:07:50 EDT 2023
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#66 by Jon E. Schoenfield at Sun Oct 29 21:07:47 EDT 2023
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| LINKS
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T. D. Noe and Donovan Johnson, <a href="/A005278/b005278.txt">Table of n, a(n) for n = 1..10000</a> (first 963 terms from T. D. Noe)
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| STATUS
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approved
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#65 by Alois P. Heinz at Sun Sep 03 20:59:46 EDT 2023
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#64 by Jon E. Schoenfield at Sun Sep 03 20:35:06 EDT 2023
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#63 by Jon E. Schoenfield at Sun Sep 03 20:33:37 EDT 2023
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| COMMENTS
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If the strong Goldbach conjecture (every even number>6 is the sum of at least 2 distinct primes p and q) is true, sequence contains only even values. Since p*q-phi(p*q)=p+q-1 and then every odd number can be expressed as x-phi(x). - Benoit Cloitre, Mar 03 2002
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| FORMULA
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A005278 = { k | A063740(k) = 0 }. - M. F. Hasler, Jan 11 2018
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| STATUS
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approved
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Discussion
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| Sun Sep 03
| 20:35
| Jon E. Schoenfield: (Fixed sentence fragment problem in Comments, removed self-reference in Formula entry.)
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#62 by Jon E. Schoenfield at Sun Dec 26 21:14:54 EST 2021
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#61 by Jon E. Schoenfield at Sun Dec 26 21:14:52 EST 2021
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| AUTHOR
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_N. J. A. Sloane_.
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| STATUS
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approved
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#60 by Michel Marcus at Sat Feb 13 06:33:01 EST 2021
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#59 by Joerg Arndt at Sat Feb 13 06:28:17 EST 2021
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#58 by Michel Marcus at Sat Feb 13 06:25:40 EST 2021
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