A066337 Decimal equivalent of A066327.

0, 2, 5, 4, 6, 9, 8, 10, 13, 12, 14, -1, -1, -1, -1, 17, 16, 18, 21, 20, 22, 25, 24, 26, 29, 28, 30, -1, -1, -1, -1, 33, 32, 34, 37, 36, 38, 41, 40, 42, 45, 44, 46, -1, -1, -1, -1, 49, 48, 50, 53, 52, 54, 57, 56, 58, 61, 60, 62, -1, -1, -1, -1, 65, 64, 66, 69, 68, 70, 73, 72, 74, 77, 76, 78, -1, -1, -1, -1, 81, 80, 82, 85, 84, 86, 89, 88

Offset: 0

Author

George E. Antoniou, Dec 15 2001

Keywords

• easy
• sign
• base

Crossrefs

Cf. A066327.

Formula

Conjectures from Chai Wah Wu, Apr 18 2024: (Start)

a(n) = a(n-1) - a(n-4) + a(n-5) - a(n-8) + a(n-9) - a(n-12) + a(n-13) + a(n-16) - a(n-17) + a(n-20) - a(n-21) + a(n-24) - a(n-25) + a(n-28) - a(n-29) for n > 28.

G.f.: x*(-x^27 + 2*x^26 - x^23 + 3*x^22 + 2*x^21 - x^20 + 2*x^19 + 5*x^18 + x^17 + 2*x^16 + 4*x^15 + 4*x^14 + 4*x^13 + 4*x^12 + 5*x^11 - 14*x^10 + 4*x^9 + 4*x^8 + 5*x^7 + x^6 + 2*x^5 + 5*x^4 + 2*x^3 - x^2 + 3*x + 2)/((x - 1)^2*(x + 1)*(x^2 + 1)*(x^4 + 1)^2*(x^8 + 1)^2). (End)

Extensions

Corrected and extended by Joshua Zucker, Jun 21 2006