18474

Appears in sequences

• Numbers whose base-4 representation contains exactly three 0's and four 2's.at n=25A045056
• Numbers k such that prime(k) + prime(k+1) is a square.at n=40A064397
• Partial sums of tetradic primes (A068188).at n=3A119742
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7.at n=9A252299
• Numbers k such that A019320(k) is in A217468.at n=33A297412
• Numbers k such that 2^m == 2 (mod m*(m-1)), where m=A019320(k).at n=44A297413