A103955 a(n) is the least k such that k-n and k are adjacent powerful numbers.

9, 27, 4, 8, 32, 214375, 16, 72, 25, 2197, 3136, 512, 49, 30459375, 64, 144, 529, 243, 100, 21316, 1352, 100489, 648, 1024, 169, 11907, 196, 1000, 36992, 6889, 392, 288, 12967201, 899236854961, 324, 900, 117649, 3125, 10648, 2744, 841, 518436000667

Offset: 1

Author

Max Alekseyev, Feb 22 2005

Keywords

• nonn

Comments

Sister sequence of a(n)-n is given by A103954.

a(105) > 10^22. - Donovan Johnson, Nov 19 2011

Links

• Donovan Johnson, Table of n, a(n) for n = 1..104

Crossrefs

Cf. A001694, A103952, A074954, A103954, A023056.

Extensions

Offset corrected by Donovan Johnson, Nov 19 2011