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A283992 a(n) = number of irreducible Stern polynomials in range B(1,x) .. B(n,x). (Polynomial B_1(x) = 1 is not included in the count). 6
0, 1, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24, 24, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 28, 28, 29, 29, 29, 29, 30, 30 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Compare a(65537) = 19681 to A000720(65537) = 6543.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10001

FORMULA

a(1) = 0, and for n > 1, a(n) = A283991(n) + a(n-1).

PROG

(Scheme) (definec (A283992 n) (if (= 1 n) 0 (+ (A283991 n) (A283992 (- n 1)))))

CROSSREFS

Partial sums of A283991. Cf. A186891, A125184, A260443, A283993, A283994.

Differs from A000720 for the first time at n=25, as here a(25) = 10.

Differs from A255574 for the first time at n=65, as here a(65) = 21.

Sequence in context: A230980 A070549 A255574 * A074796 A061070 A285879

Adjacent sequences:  A283989 A283990 A283991 * A283993 A283994 A283995

KEYWORD

nonn

AUTHOR

Antti Karttunen, Mar 20 2017

STATUS

approved

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Last modified July 18 21:25 EDT 2019. Contains 325144 sequences. (Running on oeis4.)