The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A116021 phi(n) plus the n-th prime gives a square. 1
 2, 4, 14, 27, 30, 65, 80, 113, 174, 332, 483, 498, 547, 684, 734, 737, 761, 944, 1693, 1855, 2204, 3358, 3461, 3647, 3787, 3908, 4180, 6144, 6915, 7638, 7763, 10249, 10676, 12235, 13359, 14038, 16002, 19736, 21148, 23392, 23899, 24295, 24663 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..500 EXAMPLE phi(332)+p(332)=2401=49^2. MATHEMATICA Select[Range[25000], IntegerQ[Sqrt[EulerPhi[#]+Prime[#]]]&] (* Harvey P. Dale, Oct 05 2019 *) CROSSREFS Cf. A116092, A116093. Sequence in context: A047830 A036051 A115626 * A288154 A283353 A323656 Adjacent sequences: A116018 A116019 A116020 * A116022 A116023 A116024 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 | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 13:58 EST 2022. Contains 358588 sequences. (Running on oeis4.)