A256488 -id:A256488 - cp's OEIS frontend

A256487 a(n) = A254100(n) - A219178(n).

2, 4, 0, 4, 10, 18, 16, 36, 28, 48, 78, 80, 62, 90, 76, 110, 134, 158, 200, 220, 224, 216, 236, 280, 308, 312, 262, 314, 328, 402, 430, 424, 438, 488, 506, 538, 414, 510, 642, 620, 680, 648, 656, 690, 666, 684, 730, 790, 742, 840, 844, 862, 916, 976, 1004, 1092, 1072, 1112, 1054, 1166, 1176, 1184, 1292

Offset: 1

Antti Karttunen, May 01 2015

nonn

Difference between the least nonludic number removed at the n-th stage of Ludic sieve and the least unlucky number removed at the n-th stage of Lucky sieve.

Antti Karttunen, Table of n, a(n) for n = 1..933
Index entries for sequences generated by sieves

Cf. A219178, A254100, A256482, A256486, A256488 (same terms divided by 2).

(define (A256487 n) (- (A254100 n) (A219178 n)))

a(n) = A254100(n) - A219178(n).

A260721 Half the difference between n-th odd Ludic and n-th Lucky number: a(1) = 0; a(n) = (A003309(n+1) - A000959(n))/2.

Original entry on oeis.org

0, 0, -1, -1, -1, -1, -2, -1, -3, -2, 0, -1, -3, -2, -5, -3, -1, -1, 1, 2, 1, -1, -1, 1, 2, 2, -3, -1, -1, 4, 4, 3, 1, 5, 3, 4, -4, 0, 7, 5, 8, 6, 4, 5, 2, 2, 5, 8, 3, 8, 8, 7, 9, 11, 12, 16, 14, 15, 11, 16, 16, 15, 19, 17, 16, 18, 20, 15, 14, 14, 16, 12, 11, 12, 18, 19, 21, 15, 15, 11, 13, 13, 15, 19, 20, 15, 18, 23, 24, 23, 28, 27, 27, 27, 20, 23

Offset: 1

Antti Karttunen, Aug 06 2015

sign

Antti Karttunen, Table of n, a(n) for n = 1..10000
Index entries for sequences generated by sieves

Cf. A000959, A003309, A260722, A256488.

(define (A260721 n) (if (= 1 n) 0 (/ (- (A003309 (+ 1 n)) (A000959 n)) 2)))

a(1) = 0; a(n) = (A003309(n+1) - A000959(n))/2.

a(n) = A260722(n)/2.

cp's OEIS Frontend

A256487 a(n) = A254100(n) - A219178(n).

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