1306449

Appears in sequences

• Square numbers whose reverse is triangular with the same number of digits.at n=2A066702
• Powerful(1) numbers (A001694) whose digit reversal is a triangular number.at n=9A115691
• Squares k such that k - 2 and k + 2 are prime.at n=23A144938
• Squares whose reverse is a triangular number; trailing zeros are permitted.at n=4A181412
• Number of nX2 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=6A223189
• Number of nX7 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=1A223194
• T(n,k)=Number of nXk 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=29A223195
• T(n,k)=Number of nXk 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.at n=34A223195