A278237 a(n) = A046523(A263273(n)).

1, 2, 2, 4, 2, 6, 2, 8, 4, 6, 2, 12, 2, 6, 6, 16, 4, 12, 2, 12, 6, 6, 2, 24, 2, 6, 8, 12, 6, 30, 2, 64, 6, 6, 2, 36, 2, 6, 6, 24, 2, 30, 4, 12, 12, 6, 2, 48, 2, 30, 12, 12, 2, 24, 2, 24, 6, 6, 6, 60, 2, 6, 12, 32, 2, 30, 2, 12, 6, 12, 6, 72, 6, 6, 6, 12, 2, 30, 2, 48, 16, 6, 2, 60, 2, 30, 30, 24, 6, 60, 6, 12, 6, 6, 2, 192, 6, 6, 12, 36, 2, 30, 2, 48, 6, 30, 6

Offset: 1

Author

Antti Karttunen, Nov 16 2016

Keywords

• nonn

Comments

This sequence works as a "sentinel" for A263273 by matching to any sequence that is obtained as f(A263273(n)), where f(n) is any function that depends only on the prime signature of n (see the index entry for "sequences computed from exponents in ..."). As of Nov 11 2016 no such sequences were present in the database, although a prefix of A050361 at first seemed to match. Note that A050361 really matches with A046523.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..19683
• Index entries for sequences computed from exponents in factorization of n

Crossrefs

Cf. A263273.

Differs from A046523 for the first time at n=17, where a(17)=4, while A046523(17)=2.

Cf. A050361.

Programs

Scheme

(define (A278237 n) (A046523 (A263273 n)))

Formula

a(n) = A046523(A263273(n)).