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 A262715 a(n) = 29^(2*n+1). 4
 29, 24389, 20511149, 17249876309, 14507145975869, 12200509765705829, 10260628712958602189, 8629188747598184440949, 7257147736730073114838109, 6103261246589991489578849669, 5132842708382182842735812571629, 4316720717749415770740818372739989 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS 29*a(n) is a square. LINKS G. C. Greubel, Table of n, a(n) for n = 0..250 Index entries for linear recurrences with constant coefficients, signature (841). FORMULA G.f.: 29/(1 - 841*x). a(n) = 841*a(n-1). Sum_{i>=0} (-1)^i/a(i) = 29*A021846; Sum_{i>=0} 1/a(i) = 2.9*A021088. [Bruno Berselli, Oct 06 2015] MATHEMATICA 29^Range[1, 30, 2] PROG (MAGMA) [29^(2*n+1): n in [0..15]]; (PARI) vector(20, n, n--; 29^(2*n+1)) \\ Altug Alkan, Oct 02 2015 CROSSREFS Second bisection of A009973 (powers of 29). Cf. similar sequences of the form p^(2*n+1), with p prime: A004171 (p=2), A013708 (p=3), A013710 (p=5), A013712 (p=7), A013716 (p=11), A013718 (p=13), A013722 (p=17), A013724 (p=19), A013728 (p=23), this sequence (p=29), A262716 (p=31), A262786 (p=37), A262787 (p=41), A155477 (p=43). Sequence in context: A199369 A127425 A135253 * A274545 A296176 A159437 Adjacent sequences:  A262712 A262713 A262714 * A262716 A262717 A262718 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Oct 02 2015 STATUS approved

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Last modified December 1 06:09 EST 2020. Contains 338833 sequences. (Running on oeis4.)