A280498 a(n) = A032742(A249818(n)).

1, 1, 1, 2, 1, 3, 1, 4, 3, 5, 1, 6, 1, 7, 5, 8, 1, 9, 1, 10, 9, 11, 1, 12, 5, 13, 7, 14, 1, 15, 1, 16, 15, 17, 7, 18, 1, 19, 11, 20, 1, 21, 1, 22, 27, 23, 1, 24, 7, 25, 25, 26, 1, 27, 25, 28, 21, 29, 1, 30, 1, 31, 13, 32, 11, 33, 1, 34, 45, 35, 1, 36, 1, 37, 17, 38, 11, 39, 1, 40, 33, 41, 1, 42, 35, 43, 35, 44, 1, 45, 49, 46, 81, 47, 13, 48, 1, 49, 19, 50, 1

Offset

1,4

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Formula

a(n) = A032742(A249818(n)).

a(n) = A249818(n) / A020639(n). [Because A249818 preserves the smallest prime factor of n.]

Prog

(Scheme) (define (A280498 n) (A032742 (A249818 n)))

Crossrefs

Cf. A020639, A032742, A249818.

Differs from related A280495 and A280497 for the first time at n=33, where a(33) = 15, while A280495(33) = A280497(33) = 13.

Differs from related A280496 for the first time at n=42, where a(42) = 21, while A280496(42) = 27.

Sequence in context: A280497 A280495 A302042 * A280496 A291327 A302032

Adjacent sequences: A280495 A280496 A280497 * A280499 A280500 A280501

Keyword

nonn

Author

Antti Karttunen, Jan 09 2017

Status

approved