87258

Appears in sequences

• Numbers k for which A064380(k) = k/2.at n=22A185078
• Number of (n+1)X(n+1) 0..3 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.at n=2A187698
• T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.at n=12A187699
• Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.at n=2A187700
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=9A277171
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=10A277171
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=11A277171
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=16A277171
• First 5-digit number to appear n times in the decimal expansion of Pi.at n=17A277171
• Numbers k such that iphi(k) divides k, where iphi is the infinitary Euler phi function (A064380).at n=23A373057