A278239 a(n) = A278233(A277699(n)).

1, 4, 6, 16, 12, 60, 6, 64, 30, 180, 6, 240, 12, 60, 24, 256, 240, 420, 6, 720, 12, 60, 30, 960, 6, 180, 60, 240, 30, 360, 30, 1024, 30, 5040, 30, 1680, 6, 60, 360, 2880, 30, 180, 210, 240, 120, 420, 6, 3840, 60, 60, 96, 720, 210, 1260, 6, 960, 60, 420, 30, 2160, 12, 420, 60, 4096, 180, 420, 30, 45360, 60, 420, 30, 6720, 30, 60, 840, 240, 30, 12600, 30, 11520, 12

Offset: 1

Author

Antti Karttunen, Nov 17 2016

Keywords

• nonn

Comments

Prime factorization sentinel computed for A277699. Factorization is essentially done in the polynomial ring GF(2)[X].

Links

• Antti Karttunen, Table of n, a(n) for n = 1..256
• Index entries for sequences computed from exponents in factorization of n
• Index entries for sequences operating on polynomials in ring GF(2)[X]

Crossrefs

Cf. A048720, A065621, A277320, A277699, A278233, A278238.

Programs

Scheme

(define (A278239 n) (A278233 (A277699 n)))

Formula

a(n) = A278233(A277699(n)).