39521

Properties

Appears in sequences

• arcsinh(arcsin(arcsin(x)))=x+1/3!*x^3+17/5!*x^5+561/7!*x^7+39521/9!*x^9...at n=4A012069
• a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i), array T as in A049735.at n=33A049738
• Indices of prime NSW numbers A088165.at n=18A113501
• Prime numbers p such that p - 1 is the fourth a-figurate number and nineteenth b-figurate number for some a and b.at n=34A144327
• Primes (with d digits, say) that generate another prime when acted on by the "standard" superpermutation of length A007489(d) of d elements (cf. comment).at n=37A244311
• Centered 19-gonal (or nonadecagonal) primes.at n=9A264844
• Number of nonequivalent ways (mod D_3) to place rooks on an n X n X n triangular grid so that no two of them are on the same row, column or diagonal.at n=10A283117
• Starts of runs of at least 3 consecutive odd numbers whose prime factors are all prime-indexed primes.at n=26A357168
• Prime numbersat n=4159