A116261 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-4.

7, 97, 766, 857, 909, 997, 3284, 6712, 9997, 45451, 54545, 99997, 990099, 999997, 8181818, 9999997, 70588232, 99999997, 343130553, 362637362, 363636360, 420053630, 421052631, 497975708, 502024288, 578947365, 579946366

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Crossrefs

Cf. A028557, A116130, A116255, A116260, A116262, A116268.

Sequence in context: A359637 A116288 A219088 * A289851 A362472 A242377

Adjacent sequences: A116258 A116259 A116260 * A116262 A116263 A116264

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved