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A186892

Nonprime numbers n such that the Stern polynomial B(n,x) is irreducible.

1, 25, 55, 65, 77, 91, 95, 115, 121, 125, 133, 143, 145, 161, 169, 175, 185, 203, 205, 209, 215, 235, 245, 247, 253, 265, 289, 295, 299, 301, 305, 319, 323, 329, 335, 343, 361, 377, 391, 395, 407, 415, 425, 427, 445, 451, 469, 473, 475, 485, 493, 505, 515, 517, 529, 533, 539, 545, 551, 559, 575, 581, 583, 623, 625

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OFFSET

1,2

COMMENTS

See A186891 for all numbers n such that the Stern polynomial B(n,x) is irreducible.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

PROG

(PARI) ps(n)=if(n<2, n, if(n%2, ps(n\2)+ps(n\2+1), 'x*ps(n\2)))

is(n)=!isprime(n) && polisirreducible(ps(n)) \\ Charles R Greathouse IV, Apr 07 2015

CROSSREFS

Sequence in context: A349416 A157269 A371129 * A391258 A391337 A206075