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 A250024 40n - 21. 1
 19, 59, 99, 139, 179, 219, 259, 299, 339, 379, 419, 459, 499, 539, 579, 619, 659, 699, 739, 779, 819, 859, 899, 939, 979, 1019, 1059, 1099, 1139, 1179, 1219, 1259, 1299, 1339, 1379, 1419, 1459, 1499, 1539, 1579, 1619, 1659, 1699, 1739, 1779, 1819, 1859, 1899 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is the sequence of numbers congruent to 19 mod 40. A142190 gives the primes in this sequence. LINKS Karl V. Keller, Jr., Table of n, a(n) for n = 1..10000 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA G.f.: x*(19+21*x)/(1-x)^2. - Vincenzo Librandi, Nov 11 2014 a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). - Vincenzo Librandi, Nov 11 2014 MATHEMATICA 40 Range[40] - 21 (* Alonso del Arte, Nov 10 2014 *) CoefficientList[Series[(19 + 21 x) / (1 - x)^2, {x, 0, 50}], x] (* Vincenzo Librandi, Nov 11 2014 *) PROG (Python)  for n in range(1, 101): print(40*n-21, end=", ") (MAGMA) [40*n-21: n in [1..60]]; // Vincenzo Librandi, Nov 11 2014 (PARI) a(n)=40*n-21 \\ Charles R Greathouse IV, May 23 2019 CROSSREFS Cf. A017377 (10n+9), A142190. Sequence in context: A042619 A141887 A141773 * A031375 A146351 A139920 Adjacent sequences:  A250021 A250022 A250023 * A250025 A250026 A250027 KEYWORD nonn,easy AUTHOR Karl V. Keller, Jr., Nov 10 2014 STATUS approved

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Last modified May 11 05:25 EDT 2021. Contains 343784 sequences. (Running on oeis4.)