A115548 Numbers k such that k^2 is the concatenation of two numbers m and 7*m.
91304347826086956521739130434782608695652173913043478261, 121739130434782608695652173913043478260869565217391304348, 152173913043478260869565217391304347826086956521739130435, 182608695652173913043478260869565217391304347826086956522
Offset: 1
Links
- Tanya Khovanova, Non Recursions