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A037464
Bisection of A076605.
4
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
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
Sequence in context: A082683 A084752 A260940 * A302564 A335046 A060265
KEYWORD
nonn,easy,changed
AUTHOR
N. J. A. Sloane, Nov 29 2002
EXTENSIONS
Extended by Robert G. Wilson v, Dec 02 2002
STATUS
approved