41234

Appears in sequences

• Molecular topological indices of the path graphs P_n.at n=39A121318
• a(n) is the smallest number not already in the sequence, such that the concatenation of all a(n) displays the periodic digit string 1, 2, 3, 4 (and repeat).at n=19A165302
• 4th power analog of Keith numbers.at n=20A281915
• Concatenation of the decimal digits of {n, 1..n}.at n=3A357915