A115433 Numbers k such that the concatenation of k with k-5 gives a square.

21, 30, 902406, 959721, 6040059046, 6242406405, 9842410005, 9900249006, 15033519988494, 17250863148969, 22499666270469, 27632040031654, 34182546327286, 37487353123861, 52213551379230, 74230108225630

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Example

902406_902401 = 949951^2.

Crossrefs

Cf. A030465, A102567, A115426, A115437, A115428, A115429, A115430, A115431, A115432, A115434, A115435, A115436, A115444.

Sequence in context: A318349 A228142 A276756 * A116096 A116116 A079394

Adjacent sequences: A115430 A115431 A115432 * A115434 A115435 A115436

Keyword

base,nonn

Author

Giovanni Resta, Jan 25 2006

Status

approved