61063

Appears in sequences

• n-th 4k+1 prime times (n+1)st 4k+3 prime.at n=25A048628
• a(1)=1, a(n) is the smallest integer > a(n-1) such that the sum of elements of the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals n*(n+1)/2 the n-th triangular number.at n=39A071184
• Numbers k such that sigma(k) - k - 1 is a perfect number.at n=17A293992
• Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.at n=8A297736