The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons 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 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A152586 Numbers of the form 13^(2^n) + 2. 0
 15, 171, 28563, 815730723, 665416609183179843, 442779263776840698304313192148785283, 196053476430761073330659760423566015424403280004115787589590963842248963 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS These numbers are divisible by 3. Expanding the binomial (12+1)^(2^n)+1 we get 12h+1+2 for some h and 12h+3 is divisible by 3. LINKS FORMULA a(n) = A176596(n)+2. - R. J. Mathar, Sep 10 2016 PROG (PARI) g(a, n) = if(a%2, b=2, b=1); for(x=0, n, y=a^(2^x)+b; print1(y", ")) CROSSREFS Sequence in context: A016225 A058687 A206594 * A339547 A082678 A331516 Adjacent sequences:  A152583 A152584 A152585 * A152587 A152588 A152589 KEYWORD nonn AUTHOR Cino Hilliard, Dec 08 2008 STATUS approved

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

Last modified December 2 08:31 EST 2021. Contains 349437 sequences. (Running on oeis4.)