A354576 Variant of A253028 using only odd numbers: a mirror symmetric array of odd numbers where the n-th term is equal to the number of terms in the n-th row of the array.

1, 3, 1, 5, 7, 9, 3, 1, 5, 11, 13, 7, 3, 1, 5, 9, 15, 17, 11, 7, 3, 1, 5, 9, 13, 19, 21, 15, 23, 25, 27, 17, 11, 19, 29, 31, 21, 13, 7, 3, 1, 5, 9, 15, 23, 33, 35, 25, 17, 11, 7, 3, 1, 5, 9, 13, 19, 27, 37, 39, 29, 21, 15, 23, 31, 41

Offset

1,2

Comments

See the examples in A253028 for a detailed illustration of how the array is constructed.

Links

Neal Gersh Tolunsky, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Example

1.......................1
2.....................3,1,5
3.......................7
4...................9,3,1,5,11
5................13,7,3,1,5,9,15
6.............17,11,7,3,1,5,9,13,19
7................... 21,15,23
8...................... 25
9.................27,17,11,19,29
10.........31,21,13,7,3,1,5,9,15,23,33
11......35,25,17,11,7,3,1,5,9,13,19,27,37
12.............39,29,21,15,23,31,41

Prog

(PARI) See Links section.

Crossrefs

Cf. A253028, A354577.

Sequence in context: A343615 A159285 A021080 * A049764 A136437 A137328

Adjacent sequences: A354573 A354574 A354575 * A354577 A354578 A354579

Keyword

nonn,tabf

Author

Felix Fröhlich, May 30 2022

Status

approved