Centered square numbers: a(n) = 2*n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values.
A001844
Centered square numbers: a(n) = 2*n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values.
Terms
- a(0) =1a(1) =5a(2) =13a(3) =25a(4) =41a(5) =61a(6) =85a(7) =113a(8) =145a(9) =181a(10) =221a(11) =265a(12) =313a(13) =365a(14) =421a(15) =481a(16) =545a(17) =613a(18) =685a(19) =761a(20) =841a(21) =925a(22) =1013a(23) =1105a(24) =1201a(25) =1301a(26) =1405a(27) =1513a(28) =1625a(29) =1741
External references
- oeis: A001844