2509056

Appears in sequences

• Even squares in which parity of digits alternates.at n=26A030158
• Squares which are the sum of twin prime pairs.at n=33A037072
• Smallest natural number k such that periodic part of 1/sqrt(k) is n (or 0 if no such number exists).at n=13A037211
• a(n) = 121*12^(n-2), a(0)=1, a(1)=10.at n=6A056116
• On a 3 X 3 board, the number of n-move paths for a chess king.at n=9A086349
• Numbers of the form (11^i)*(12^j), with i, j >= 0.at n=25A108218
• Perfect powers which are the sum of twin prime pairs.at n=36A119767
• a(n) = least square such that the subsets of {a(1),...,a(n)} sum to 2^n different values.at n=20A138858
• Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=31A208138
• Squares s such that first m and last m digits of the binary representation are perfect positive squares written in binary, and m = floor(binaryLength(s)/2), where binaryLength(s) = A070939(s) is the binary length of s.at n=9A226836
• Number of irredundant sets in the n X n bishop graph.at n=5A290714
• a(n) = Product_{d|n} (d*sigma(d)) where sigma(k) = the sum of the divisors of k (A000203).at n=32A324980