50281

Appears in sequences

• Positive integers k such that k-th triangular number is palindromic.at n=24A008509
• Index of the smallest n-digit palindromic triangular number, or 0 if no such number exists.at n=9A068642
• Numbers k such that the sum of the divisors of 2*k^2 is a square.at n=11A097023
• a(n)=sqrt(A145848(n)).at n=12A146991
• Number of nX7 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=4A241254
• Number of 5Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=6A241259
• Row sums of the triangle A322550.at n=34A320043
• Counterexamples to a conjecture about integers representable as the quotient of two Cantor numbers (A005823).at n=5A339636
• Row sums of A371783 and A371954 (k-quanimous partitions).at n=38A372121