A115539
Numbers k such that the concatenation of k with 5*k gives a square.
Original entry on oeis.org
2040816326530612245, 8163265306122448980, 18367346938775510205, 265008112493239588967009194159005, 346133044889129259058950784207680, 438074634937804218496484586262845, 540832882639264467279610600324500
Offset: 1
2040816326530612245_10204081632653061225 = 14285714285714285715^2.
A115540
Numbers k such that k^2 is the concatenation of two numbers m and 5*m.
Original entry on oeis.org
14285714285714285715, 28571428571428571430, 42857142857142857145, 1627906976744186046511627906976745, 1860465116279069767441860465116280
Offset: 1
14285714285714285715^2 = 2040816326530612245_10204081632653061225.
A115541
Numbers k such that the concatenation of 5*k with k gives a square.
Original entry on oeis.org
1020408163265306122449, 4081632653061224489796, 9183673469387755102041, 106678449690695619239994950132559020325716449943188991289, 123721752304002019946976391869713420022724403484408534276
Offset: 1
5102040816326530612245_1020408163265306122449 = 7142857142857142857143^2.
A115542
Numbers k such that k^2 is the concatenation of two numbers 5*m and m.
Original entry on oeis.org
7142857142857142857143, 14285714285714285714286, 21428571428571428571429, 730337078651685393258426966292134831460674157303370786517
Offset: 1
7142857142857142857143^2 = 5102040816326530612245_1020408163265306122449.
A115543
Numbers k such that the concatenation of k with 6*k gives a square.
Original entry on oeis.org
1, 20408163265306122448979591836734694, 81632653061224489795918367346938776, 20408163265306122448979591836734693877551020408163265306122448979591836734694
Offset: 1
A115544
Numbers k such that k^2 is the concatenation of two numbers m and 6*m.
Original entry on oeis.org
4, 142857142857142857142857142857142858, 285714285714285714285714285714285716, 142857142857142857142857142857142857142857142857142857142857142857142857142858
Offset: 1
A115545
Numbers k such that the concatenation of 6*k with k gives a square.
Original entry on oeis.org
122449, 489796, 122448979591836734693877551020408163265306122449, 489795918367346938775510204081632653061224489796
Offset: 1
734694_122449 = 857143^2.
A115546
Numbers k such that k^2 is the concatenation of two numbers 6*m and m.
Original entry on oeis.org
857143, 1714286, 857142857142857142857142857142857142857142857143, 1714285714285714285714285714285714285714285714286
Offset: 1
857143^2 = 734694_122449.
A115547
Numbers k such that the concatenation of 7*k with k gives a square.
Original entry on oeis.org
11909262759924385633270321361058601134215500945179584121, 21172022684310018903591682419659735349716446124763705104, 33081285444234404536862003780718336483931947069943289225, 47637051039697542533081285444234404536862003780718336484
Offset: 1
A115548
Numbers k such that k^2 is the concatenation of two numbers m and 7*m.
Original entry on oeis.org
91304347826086956521739130434782608695652173913043478261, 121739130434782608695652173913043478260869565217391304348, 152173913043478260869565217391304347826086956521739130435, 182608695652173913043478260869565217391304347826086956522
Offset: 1