23129

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 60.at n=0A031648
• Main diagonal of array in A083140.at n=25A083141
• Brilliant numbers k such that 2k+1 is also brilliant.at n=11A085649
• Brilliant numbers (A078972) whose digit reversal is a pentagonal number (A000326).at n=9A115679
• Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).at n=29A115708
• a(1) = 1; for n>1, a(n) = the smallest number p > a(n-1) such that (a(n-1)+p)/2 is a cube.at n=27A126950
• Semiprimes whose prime factors differ from each other in one bit position only.at n=54A261077