66841

Properties

Appears in sequences

• Largest prime substring in 6^n (0 if none).at n=18A046272
• First primes of record chains of consecutive primes such that all of them are evil (A027699).at n=6A177748
• Total number of congruence subgroups of PSL(2,Z) of genus n.at n=21A258691
• E.g.f.: exp(x + 4*x^2 + 9*x^3).at n=6A293721
• Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} j^2*x^j).at n=42A293724
• Prime numbersat n=6660