A017162 -id:A017162 - cp's OEIS frontend

A157952 a(n) = 162*n + 1.

163, 325, 487, 649, 811, 973, 1135, 1297, 1459, 1621, 1783, 1945, 2107, 2269, 2431, 2593, 2755, 2917, 3079, 3241, 3403, 3565, 3727, 3889, 4051, 4213, 4375, 4537, 4699, 4861, 5023, 5185, 5347, 5509, 5671, 5833, 5995, 6157, 6319, 6481, 6643, 6805, 6967

Offset: 1

Vincenzo Librandi, Mar 10 2009

The identity (162*n + 1)^2 - (81*n^2 + n)*18^2 = 1 can be written as a(n)^2 - (A017162(n) + n)*18^2 = 1. - Vincenzo Librandi, Feb 10 2012

Vincenzo Librandi, Table of n, a(n) for n = 1..10000
E. J. Barbeau, Polynomial Excursions, Chapter 10: Diophantine equations (2010), pages 84-85 (row 14 in the first table at p. 85, case d(t) = t*(9^2*t+1)).
Index entries for linear recurrences with constant coefficients, signature (2, -1).

Cf. A017162.

I:=[163, 325]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]]; // Vincenzo Librandi, Feb 10 2012

162Range[50]+1 (* or *) LinearRecurrence[{2,-1},{163,325},50](* Harvey P. Dale, Aug 10 2011 *)

for(n=1, 50, print1(162*n+1", ")); \\ Vincenzo Librandi, Feb 10 2012

a(n) = 2*a(n-1) - a(n-2), a(0)=163, a(1)=325. - Harvey P. Dale, Aug 10 2011

G.f.: x*(163-x)/(1-x)^2. - Vincenzo Librandi, Feb 10 2012

A303302 a(n) = 34*n^2.

Original entry on oeis.org

0, 34, 136, 306, 544, 850, 1224, 1666, 2176, 2754, 3400, 4114, 4896, 5746, 6664, 7650, 8704, 9826, 11016, 12274, 13600, 14994, 16456, 17986, 19584, 21250, 22984, 24786, 26656, 28594, 30600, 32674, 34816, 37026, 39304, 41650, 44064, 46546, 49096, 51714, 54400, 57154, 59976, 62866, 65824, 68850, 71944

Offset: 0

Omar E. Pol, May 13 2018

Sequence found by reading the line from 0, in the direction 0, 34, ..., in the square spiral whose vertices are the generalized 19-gonal numbers A303813.

Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

Cf. A005843, A008599, A303813.

Cf. similar sequences of the type k*n^2: A000290 (k=1), A001105 (k=2), A033428 (k=3), A016742 (k=4), A033429 (k=5), A033581 (k=6), A033582 (k=7), A139098 (k=8), A016766 (k=9), A033583 (k=10), A033584 (k=11), A135453 (k=12), A152742 (k=13), A144555 (k=14), A064761 (k=15), A016802 (k=16), A244630 (k=17), A195321 (k=18), A244631 (k=19), A195322 (k=20), A064762 (k=21), A195323 (k=22), A244632 (k=23), A195824 (k=24), A016850 (k=25), A244633 (k=26), A244634 (k=27), A064763 (k=28), A244635 (k=29), A244636 (k=30), A244082 (k=32), this sequence (k=34), A016910 (k=36), A016982 (k=49), A017066 (k=64), A017162 (k=81), A017270 (k=100), A017390 (k=121), A017522 (k=144).

[34*n^2: n in [0..50]]; // Vincenzo Librandi Jun 07 2018

Table[34 n^2, {n, 0, 40}]
LinearRecurrence[{3,-3,1},{0,34,136},50] (* Harvey P. Dale, Jul 23 2018 *)

PARI
```
a(n) = 34*n^2;
```

concat(0, Vec(34*x*(1 + x) / (1 - x)^3 + O(x^40))) \\ Colin Barker, Jun 12 2018

a(n) = 34*A000290(n) = 17*A001105(n) = 2*A244630(n).
G.f.: 34*x*(1 + x)/(1 - x)^3. - Vincenzo Librandi, Jun 07 2018
From Elmo R. Oliveira, Dec 02 2024: (Start)
E.g.f.: 34*x*(1 + x)*exp(x).
a(n) = A005843(n)*A008599(n).
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n > 2. (End)

cp's OEIS Frontend

A157952 a(n) = 162*n + 1.

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A303302 a(n) = 34*n^2.

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Author

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Magma

Mathematica

PARI

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