557040

Appears in sequences

• Triangular numbers whose digit reversal is also a triangular number.at n=28A061455
• a(n) = n^4 - (n-1)^4 + (n-2)^4 - ... 0^4.at n=32A062392
• Nonpalindromic triangular numbers whose digit reversal is also a triangular number (possibly with fewer digits).at n=14A069673
• Triangular numbers whose digit reversal is a pentagonal number (A000326).at n=7A115682
• a(n) = 1*3*5 + 3*5*7 + 5*7*9 + ... (n terms).at n=22A196506
• Number of order-preserving or order-reversing full contraction mappings of an n-chain.at n=15A221882
• Positive numbers m such that m^2 - 1 divides 2^m - 1.at n=33A247219