A068962 Number of successive terms of A028356 that add to n; or length of n-th term of A028355.

1, 1, 1, 1, 2, 3, 2, 4, 3, 4, 5, 5, 5, 5, 6, 7, 7, 7, 7, 8, 9, 8, 10, 9, 10, 11, 11, 11, 11, 12, 13, 13, 13, 13, 14, 15, 14, 16, 15, 16, 17, 17, 17, 17, 18, 19, 19, 19, 19, 20, 21, 20, 22, 21, 22, 23, 23, 23, 23, 24, 25, 25, 25, 25, 26, 27, 26, 28, 27, 28, 29, 29, 29, 29, 30, 31, 31

Offset: 1

Author

N. J. A. Sloane, Apr 08 2002

Keywords

• nonn
• easy

References

• Suggested by R. K. Guy, Mar 01 2002.

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A028355, A028356.

Formula

Each group of 15 terms is 6 more than the previous group.

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

a(n) = a(n-1) + a(n-15) - a(n-16) for n > 16.

G.f.: x*(x^14 + x^10 + x^9 - x^8 + 2*x^7 - x^6 + x^5 + x^4 + 1)/(x^16 - x^15 - x + 1). (End)

Extensions

More terms from Jim McCann (jmccann(AT)umich.edu), Jul 16 2002