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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 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

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Last modified September 26 20:34 EDT 2021. Contains 347672 sequences. (Running on oeis4.)