A296091 a(1) = 1 and for n > 1, the least number with the same prime signature as sigma(n)-1.

1, 2, 2, 6, 2, 2, 2, 6, 12, 2, 2, 8, 2, 2, 2, 30, 2, 6, 2, 2, 2, 6, 2, 2, 30, 2, 6, 6, 2, 2, 2, 6, 2, 2, 2, 60, 2, 2, 6, 2, 2, 6, 2, 2, 6, 2, 2, 6, 24, 12, 2, 2, 2, 6, 2, 6, 2, 2, 2, 2, 2, 6, 2, 60, 2, 6, 2, 8, 6, 6, 2, 6, 2, 2, 6, 2, 6, 2, 2, 6, 120, 8, 2, 2, 2, 2, 6, 2, 2, 2, 6, 2, 2, 6, 6, 2, 2, 30, 6, 216, 2, 6, 2, 6, 2

Offset: 1

Author

Antti Karttunen, Dec 07 2017

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..65537

Crossrefs

Cf. A000203, A039653, A046523, A296211.

Cf. also A276528, A296092.

Programs

Scheme

(define (A296091 n) (if (= 1 n) n (A046523 (+ -1 (A000203 n)))))

Formula

a(1) = 1; for n > 1, a(n) = A046523(A000203(n)-1) = A046523(A039653(n)).