A116322 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+5.

41, 59, 32262233, 67737767, 79321057, 3341093417798787499094, 3861488851737861033962, 4747922651210186579788, 5252077348789813420212, 6138511148262138966038, 6658906582201212500906, 7232275368591793618232

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Example

79321057 * 79321058 = 62918301//62918306, where // denotes concatenation.

Crossrefs

Cf. A116112, A116314, A116323, A116329.

Sequence in context: A232728 A113338 A222577 * A153681 A179826 A067832

Adjacent sequences: A116319 A116320 A116321 * A116323 A116324 A116325

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved