A255545 -id:A255545 - cp's OEIS frontend

A265859 Unluckiness of n.

0, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 3, 1, 0, 1, 2, 1, 0, 1, 4, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 3, 1, 2, 1, 0, 1, 5, 1, 2, 1, 0, 1, 0, 1, 2, 1, 6, 1, 4, 1, 2, 1, 3, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 0, 1, 2, 1, 0, 1, 3, 1, 2, 1, 7, 1, 0

Offset: 1

Max Barrentine, Dec 17 2015

nonn

If n is lucky, a(n)=0; if n is unlucky, a(n) is the step at which n is rejected from the lucky number sieve.

Max Barrentine, Table of n, a(n) for n = 1..10000

Cf. A000959, A050505, A145649, A260437, A260438.
Cf. also arrays A255543, A255545.
Cf. A271420 (analogous sequence).

(define (A265859 n) (* (- 1 (A145649 n)) (A260438 n))) ;; Antti Karttunen, Sep 11 2016

a(n) = (1-A145649(n)) * A260438(n). - Antti Karttunen, Sep 11 2016, corrected Nov 15 2019

A255547 Lucky / Unlucky array, transposed.

Original entry on oeis.org

1, 3, 2, 7, 5, 4, 9, 19, 11, 6, 13, 27, 39, 17, 8, 15, 45, 57, 61, 23, 10, 21, 55, 97, 91, 81, 29, 12, 25, 85, 117, 147, 121, 103, 35, 14, 31, 109, 177, 181, 199, 153, 123, 41, 16, 33, 139, 225, 277, 243, 253, 183, 145, 47, 18, 37, 157, 295, 345, 369, 315, 301, 217, 165, 53, 20, 43, 175, 325, 447, 465, 471, 379, 351, 247, 187, 59, 22

Offset: 1

Antti Karttunen, Feb 25 2015

See comments at A255545.

Transpose: A255545.
Inverse: A255548.
Topmost row: A000959, under which follows the rows of array A255544.

(define (A255547 n) (A255545bi (A004736 n) (A002260 n))) ;; Other code as in A255545 and A255543.

cp's OEIS Frontend

A265859 Unluckiness of n.

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