42696

Appears in sequences

• Numbers n such that prime(n) + reversal(prime(n)) is a square.at n=40A227371
• The number of permutations of length n sortable by 2 reversals.at n=23A228396
• The number of binary pattern classes in the (2,n)-rectangular grid with 7 '1's and (2n-7) '0's: two patterns are in same class if one of them can be obtained by a reflection or 180-degree rotation of the other.at n=11A228582
• G.f.: Sum_{n>=0} x^n/((1+x)^(2*n)*(1 - (2*n)*x)).at n=9A245156
• Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.at n=7A260604
• Square analog to Keith numbers.at n=15A274769
• Numbers k such that k - 13, k + 1, k + 5, k + 7, and k + 13 are all prime.at n=10A281937