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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
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
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Apr 11 2010
EXTENSIONS
Definition clarified by Jon E. Schoenfield, Jun 18 2010
STATUS
approved

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)