A110233 a(n) is the minimal b >= n such that the sum of consecutive integers from n to b is a perfect power.

8, 4, 7, 4, 13, 16, 19, 8, 9, 28, 13, 13, 14, 40, 43, 16, 49, 22, 55, 28, 28, 64, 27, 25, 25, 28, 27, 52, 85, 88, 91, 32, 97, 100, 40, 36, 44, 43, 49, 41, 121, 124, 47, 130, 53, 52, 49, 142, 49, 71, 77, 69, 67, 160, 70, 136, 64, 67, 175, 61, 181, 63, 187, 64, 193, 196, 85, 94

Offset

1,1

Links

Table of n, a(n) for n=1..68.

Example

a(5)=13 because 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 = 81 = 3^4.

Crossrefs

Cf. A110234, A108910.

Sequence in context: A242023 A249415 A021122 * A179260 A254246 A369103

Adjacent sequences: A110230 A110231 A110232 * A110234 A110235 A110236

Keyword

easy,nonn

Author

Jason Earls, Jul 17 2005

Status

approved