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A158060
a(n) = 25*n + 1.
1
26, 51, 76, 101, 126, 151, 176, 201, 226, 251, 276, 301, 326, 351, 376, 401, 426, 451, 476, 501, 526, 551, 576, 601, 626, 651, 676, 701, 726, 751, 776, 801, 826, 851, 876, 901, 926, 951, 976, 1001, 1026, 1051, 1076, 1101, 1126, 1151, 1176, 1201, 1226, 1251
OFFSET
1,1
FORMULA
a(n) = 2*a(n-1) -a(n-2).
G.f.: x*(26-x)/(x-1)^2.
MATHEMATICA
LinearRecurrence[{2, -1}, {26, 51}, 50]
Range[26, 2000, 25] (* Vladimir Joseph Stephan Orlovsky, Jun 14 2011 *)
25*Range[50]+1 (* Harvey P. Dale, Nov 23 2018 *)
PROG
(Magma) I:=[26, 51]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..60]];
(PARI) a(n)=25*n+1 \\ Charles R Greathouse IV, Jun 14 2011
CROSSREFS
Sequence in context: A073249 A044078 A044459 * A169861 A249912 A267039
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Mar 12 2009
STATUS
approved