A280497 a(n) = A032742(A249817(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, 13, 17, 7, 18, 1, 19, 21, 20, 1, 21, 1, 22, 11, 23, 1, 24, 7, 25, 25, 26, 1, 27, 13, 28, 33, 29, 1, 30, 1, 31, 19, 32, 19, 33, 1, 34, 37, 35, 1, 36, 1, 37, 17, 38, 11, 39, 1, 40, 15, 41, 1, 42, 31, 43, 45, 44, 1, 45, 17, 46, 57, 47, 37, 48, 1, 49, 27, 50, 1

Offset

1,4

Links

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

Formula

a(n) = A032742(A249817(n)).

a(n) = A249817(n) / A020639(n). [Because A249817 preserves the smallest prime factor of n.]

Prog

(Scheme) (define (A280497 n) (A032742 (A249817 n)))

Crossrefs

Cf. A020639, A032742, A249817.

Differs from related A280496 and A280498 for the first time at n=33, where a(33) = 13, while A280496(33) = A280498(33) = 15.

Differs from related A280495 for the first time at n=42, where a(42) = 21, while A280495(42) = 27.

Sequence in context: A060654 A291329 A291328 * A280495 A302042 A280498

Adjacent sequences: A280494 A280495 A280496 * A280498 A280499 A280500

Keyword

nonn

Author

Antti Karttunen, Jan 09 2017

Status

approved