50721

Appears in sequences

• Generalized Catalan numbers C(-8; n).at n=5A064330
• Triangular numbers with property that digits alternate in parity.at n=41A068882
• Triangular numbers with property that digits alternate in parity individually as well as in concatenation with previous terms.at n=20A068889
• Triangular numbers whose digit permutations yield at least two further triangular numbers.at n=28A069674
• Nonpalindromic numbers m such that the difference between the square of m and the square of the reversal of m is itself a perfect square. Numbers ending in 0 are excluded.at n=3A202386
• Triangular numbers that are hypotenuse and a leg of a Pythagorean triple.at n=40A213188
• Nonpalindromic positive integers k such that the absolute value of k^2 - reverse(k)^2 is a square.at n=8A256515
• The first of three consecutive triangular numbers the sum of which is equal to the sum of three consecutive primes.at n=27A298168
• Numbers that start a run of four consecutive triangular numbers with four distinct prime factors.at n=8A349773
• Numbers k such that k - sopfr(k) is a positive fourth power.at n=8A390141