22497

Appears in sequences

• a(n) = smallest k such that 4k has a digit sum = n.at n=41A077490
• Twin prime products minus 2.at n=11A124659
• Product of successive primes minus 2.at n=34A124669
• Centered 32-gonal numbers.at n=37A195315
• Numbers n such that Q(sqrt(n)) has class number 9.at n=34A218041
• Fundamental discriminants of real quadratic number fields with class number 9.at n=24A218159
• Positive integers m such that none of the four consecutive numbers m, m+1, m+2, m+3 can be written as p^2 + q with p and q both prime.at n=13A258661
• Expansion of Sum_{k>=0} x^k * Product_{j=1..k} (1 + x^j)^j.at n=25A306731
• Number of chiral pairs of asymmetric polyominoes with n octagonal cells of the hyperbolic regular tiling with Schläfli symbol {8,oo}.at n=3A389939