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#12 by Wesley Ivan Hurt at Fri Dec 29 21:33:18 EST 2023
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#11 by Wesley Ivan Hurt at Fri Dec 29 21:32:55 EST 2023
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| EXAMPLE
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7 because 3*phi(3)+1= = 7 is prime.
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| CROSSREFS
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Cf. A002618, A046078.
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| STATUS
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approved
editing
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#10 by Charles R Greathouse IV at Thu Nov 21 12:47:06 EST 2013
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| MATHEMATICA
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Select[Array[# EulerPhi[#]+1&, 500], PrimeQ] (* From ] (* _Harvey P. Dale, _, Apr 21 2012 *)
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Discussion
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| Thu Nov 21
| 12:47
| OEIS Server: https://oeis.org/edit/global/2062
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#9 by N. J. A. Sloane at Sat May 18 16:49:25 EDT 2013
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Discussion
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| Sat May 18
| 16:49
| OEIS Server: https://oeis.org/edit/global/1921
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#8 by Harvey P. Dale at Sat Apr 21 13:40:04 EDT 2012
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#7 by Harvey P. Dale at Sat Apr 21 13:40:01 EDT 2012
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| MATHEMATICA
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Select[Array[# EulerPhi[#]+1&, 500], PrimeQ] (* From Harvey P. Dale, Apr 21 2012 *)
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| STATUS
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approved
editing
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#6 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010
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| LINKS
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T. D. Noe, <a href="="/A046062/b046062.txt">Table of n, a(n) for n=1..1000</a>
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| KEYWORD
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easy,nice,nonn,new
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#5 by N. J. A. Sloane at Wed Oct 20 03:00:00 EDT 2010
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| KEYWORD
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easy,nice,nonn,new
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| AUTHOR
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Felice Russo (felice.russofrusso(AT)katamailmicron.com)
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#4 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009
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| LINKS
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T. D. Noe, <a href="http://www.research.att.com/~njas/sequences/b046062.txt">Table of n, a(n) for n=1..1000</a>
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| KEYWORD
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easy,nice,nonn,new
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#3 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007
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| COMMENTS
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Listed in order of increasing n.
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| LINKS
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T. D. Noe, <a href="http://www.research.att.com/~njas/sequences/b046062.txt">Table of n, a(n) for n=1..1000</a>
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| CROSSREFS
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Cf. A002618, A046078
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| KEYWORD
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easy,nice,nonn,new
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