A115443 Numbers whose square is the concatenation of two numbers k and k-4.

81, 8157, 9801, 467347, 532654, 998001, 76450589, 99980001, 7801738415, 8593817623, 9208120793, 9999800001, 346667333467, 401461854015, 598538145986, 653332666534, 945207479453, 999998000001, 48349470735060

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Example

9605_9601 = 9801^2.

Crossrefs

Cf. A030467, A106497, A115432, A115427, A115438, A115439, A115440, A115441, A115442, A115444, A115445, A115446, A115447.

Sequence in context: A206504 A046172 A123847 * A328089 A186527 A178511

Adjacent sequences: A115440 A115441 A115442 * A115444 A115445 A115446

Keyword

base,nonn

Author

Giovanni Resta, Jan 25 2006

Status

approved