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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A122902 First occurrence of exponent n in A080121 corresponding to the minimum prime of the form (k^(2^n) + (k+1)^(2^n)) = A122900(k). 2
 1, 3, 23, 21, 10, 95, 255, 86, 59 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Minimum primes of the form n^(2^m) + (n+1)^(2^m) are listed in A122900. The exponents m are listed in A080121. a(10)-a(13)>1000, a(14)-a(16)>100. LINKS Eric Weisstein's World of Mathematics, Generalized Fermat Number EXAMPLE A080121 begins with 1,1,2,1,1,2,1,2,1,5,?,1,2,1,?,2,1,?,1,?,4,1,3,1,..., where the unknown terms (denoted with ?) are at least 10. So a(1) = 1, a(2) = 3, a(3) = 23, a(4) = 21, a(5) = 10. CROSSREFS Cf. A077659, A080121, A122900, A080208, A078902, A080134, A019434, A153504, A152913, A194185. Sequence in context: A130475 A212998 A157819 * A297855 A298090 A298052 Adjacent sequences:  A122899 A122900 A122901 * A122903 A122904 A122905 KEYWORD hard,more,nonn AUTHOR Alexander Adamchuk, Sep 18 2006, Oct 01 2006 EXTENSIONS Edited by Max Alekseyev, Sep 09 2020 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 May 16 02:09 EDT 2022. Contains 353687 sequences. (Running on oeis4.)