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A262787
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a(n) = 41^(2*n+1).
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2
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41, 68921, 115856201, 194754273881, 327381934393961, 550329031716248441, 925103102315013629321, 1555098314991537910888601, 2614120267500775228203738281, 4394336169668803158610484050361, 7386879101213258109624223688656841, 12417343769139486882278320020632149721
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OFFSET
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0,1
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COMMENTS
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41*a(n) is a square.
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LINKS
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FORMULA
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G.f.: 41/(1 - 1681*x).
a(n) = 1681*a(n-1).
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MAPLE
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MATHEMATICA
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41^Range[1, 30, 2]
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PROG
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(Magma) [41^(2*n+1): n in [0..15]];
(PARI) vector(20, n, n--; 41^(2*n+1)) \\ Altug Alkan, Oct 08 2015
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CROSSREFS
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Second bisection of A009985 (powers of 41).
Cf. similar sequences listed in A262715.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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