login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174623 (2^p+1)^2 where p is prime. 1
25, 81, 1089, 16641, 4198401, 67125249, 17180131329, 274878955521, 70368760954881, 288230377225453569, 4611686022722355201, 18889465931753458761729, 4835703278462914745335809, 77371252455353859367239681, 19807040628566365873362698241 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..200

FORMULA

a(n) = (A098640(n))^2. - R. J. Mathar, Jul 06 2010

EXAMPLE

For p=2, (2^2+1)^2=25;

for p=3, (2^3+1)^2=81;

for p=5, (2^5+1)^2=1089.

MAPLE

A174623:=n->(2^ithprime(n)+1)^2: seq(A174623(n), n=1..20); # Wesley Ivan Hurt, Apr 18 2017

MATHEMATICA

Table[(2^Prime[n] + 1)^2, {n, 30}] (* Vincenzo Librandi, Apr 29 2014 *)

PROG

(MAGMA) [(2^p+1)^2: p in [0..1000] |IsPrime(p)]

CROSSREFS

Sequence in context: A016814 A280343 A204708 * A100487 A157530 A253053

Adjacent sequences:  A174620 A174621 A174622 * A174624 A174625 A174626

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Apr 11 2010

EXTENSIONS

Definition clarified by Jon E. Schoenfield, Jun 18 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 12 17:06 EST 2019. Contains 329058 sequences. (Running on oeis4.)