21904

Appears in sequences

• a(n) = (prime(n) - 1)^2.at n=34A005722
• Squares of even heptagonal numbers.at n=4A014792
• a(n) = (4*n)^2.at n=37A016802
• a(n) = (5*n + 3)^2.at n=29A016886
• a(n) = (6*n + 4)^2.at n=24A016958
• a(n) = (7*n + 1)^2.at n=21A016994
• a(n) = (8*n + 4)^2.at n=18A017114
• a(n) = (9*n + 4)^2.at n=16A017210
• a(n) = (10*n + 8)^2.at n=14A017366
• a(n) = (11*n + 5)^2.at n=13A017450
• a(n) = (12*n + 4)^2.at n=12A017570
• a(n) is least k such that k and k+n are adjacent nontrivial powers of positive integers, or 0 if no such k apparently exists.at n=47A023056
• Numbers with 15 divisors.at n=20A030633
• Theta series of A2[hole]^4.at n=39A033690
• Triangle read by rows: matrix 4th power of the Stirling2 triangle A008277.at n=16A039812
• Squares with initial digit '2'.at n=20A045785
• Row sums of A051599.at n=12A053210
• Denominator of 1/16 - 1/n^2.at n=33A061042
• Squares with digital root 7.at n=32A061101
• Squares whose sum of digits as well as product of digits is a square (allowing zero).at n=26A061869