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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A172146 Primes of form x^y + y^x + 1 0
 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 101, 2531, 4241, 5393, 94933, 262469, 16797953, 48989177, 78371693633, 2552470327703, 4747732369319, 17832200896513, 131621703955647041, 4052555153019035587 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..28. EXAMPLE a(1)=1^1+1^1+1=3 a(2)=1^3+3^1+1=5 a(3)=1^5+5^1+1=7 ... a(15)=2^6+6^2+1=101 MATHEMATICA a[n_] := Block[{}, For[l = {}; i = 1, i < n, i++, For[j = i, j < n, j++, x = i^j + j^i + 1; If[PrimeQ[x], l = Append[l, x]]]]; Print[Sort[Union[l]]]]; a[50] CROSSREFS Cf. A094133, A172142 Sequence in context: A191376 A179429 A020615 * A225670 A165255 A223036 Adjacent sequences: A172143 A172144 A172145 * A172147 A172148 A172149 KEYWORD nonn AUTHOR Cheng Zhang (cz1(AT)rice.edu), Jan 26 2010, Mar 03 2010 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 April 15 04:34 EDT 2024. Contains 371667 sequences. (Running on oeis4.)