This site is supported by donations to The OEIS Foundation.

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A116035 Numbers n such that n+phi(n)+sigma(n) is a prime. 1
 1, 4, 15, 33, 35, 36, 50, 55, 57, 64, 65, 75, 77, 85, 87, 93, 98, 115, 119, 129, 133, 143, 155, 159, 185, 187, 189, 205, 213, 215, 217, 219, 242, 243, 247, 253, 265, 287, 295, 303, 309, 323, 324, 327, 339, 345, 365, 385, 393, 395, 407, 425, 427, 453, 469, 493 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 EXAMPLE 205+phi(205)+sigma(205) = 617 (prime). MATHEMATICA Select[Range[500], PrimeQ[#+EulerPhi[#]+DivisorSigma[1, #]]&] (* Harvey P. Dale, Nov 09 2014 *) CROSSREFS Cf. A078762, A068080. Sequence in context: A188075 A121914 A110341 * A256715 A022265 A120389 Adjacent sequences:  A116032 A116033 A116034 * A116036 A116037 A116038 KEYWORD nonn AUTHOR Giovanni Resta, Feb 13 2006 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 28 19:37 EST 2015. Contains 264621 sequences.