A037464 Bisection of A076605.

3, 5, 7, 7, 11, 13, 13, 17, 19, 19, 23, 23, 5, 29, 31, 31, 11, 37, 37, 41, 43, 43, 47, 47, 17, 53, 53, 19, 59, 61, 61, 13, 67, 67, 71, 73, 73, 11, 79, 79, 83, 83, 29, 89, 89, 31, 31, 97, 97, 101, 103, 103, 107, 109, 109, 113, 113, 23, 17, 17, 41, 41, 127, 127, 131, 131, 19

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

a(n) = max(A006530(2n-1), A006530(2n+1)).

a(n) = A076605(2*n). - Amiram Eldar, Nov 03 2024

Mathematica

Table[ Last[ Table[ # [[1]]] & /@ FactorInteger[n^2 - 1]], {n, 2, 150, 2}]

Prog

(PARI) a(n) = my(p = factor(4*n^2-1)[, 1]); p[#p]; \\ Amiram Eldar, Nov 03 2024

Crossrefs

Cf. A076605, A074399.

Sequence in context: A082683 A084752 A260940 * A302564 A335046 A060265

Adjacent sequences: A037461 A037462 A037463 * A037465 A037466 A037467

Keyword

nonn,easy

Author

N. J. A. Sloane, Nov 29 2002

Extensions

Extended by Robert G. Wilson v, Dec 02 2002

Status

approved