A077491 a(n) = smallest k such that 2k has digit sum = n.

5, 1, 6, 2, 7, 3, 8, 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 99, 149, 199, 249, 299, 349, 399, 449, 499, 999, 1499, 1999, 2499, 2999, 3499, 3999, 4499, 4999, 9999, 14999, 19999, 24999, 29999, 34999, 39999, 44999, 49999, 99999, 149999, 199999, 249999, 299999

Offset: 1

Author

Amarnath Murthy, Nov 07 2002

Keywords

• base
• nonn
• easy

Links

• Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,10,-10).

Crossrefs

Cf. A069532, A069534.

Formula

a(n) = A069532(n)/2.

Extensions

More terms from Ray Chandler, Jul 28 2003