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A255572 a(n) = Number of terms larger than one in range 0 .. n of A205783. 7
0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 5, 5, 6, 6, 7, 8, 9, 9, 10, 10, 11, 12, 13, 13, 14, 14, 15, 16, 17, 17, 18, 18, 19, 20, 21, 22, 23, 23, 24, 25, 26, 26, 27, 27, 28, 29, 30, 30, 31, 32, 33, 34, 35, 35, 36, 36, 37, 38, 39, 39, 40, 40, 41, 42, 43, 44, 45, 45, 46, 46, 47, 47, 48, 48, 49, 50, 51, 51, 52, 52, 53, 53 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..8192

FORMULA

Other identities and observations. For all n >= 1:

a(n) = A255573(n) - 1.

a(n) <= A065855(n).

a(n) <= A091245(n).

PROG

(PARI)

A255572_write_bfile(up_to_n) = { my(n, a_n=0); for(n=0, up_to_n, if(((n > 1) && !polisirreducible(Pol(binary(n)))), a_n++); write("b255572.txt", n, " ", a_n)); };

A255572_write_bfile(8192);

CROSSREFS

Essentially one less than A255573 (after the initial zero).

Cf. A065855, A091245, A205783, A255574.

Sequence in context: A050296 A057062 A283993 * A065855 A236863 A242976

Adjacent sequences:  A255569 A255570 A255571 * A255573 A255574 A255575

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 14 2015

STATUS

approved

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Last modified January 20 11:11 EST 2020. Contains 331083 sequences. (Running on oeis4.)