42473

Properties

Appears in sequences

• a(n) = prime((a(n-1) + 1)/2), a(1) = 21.at n=8A104297
• Numbers k such that the k-th triangular number contains only digits {0,1,9}.at n=16A119048
• Number of one-sided n-step prudent walks, avoiding 4 or more consecutive east steps.at n=12A190360
• Primes of the form 3n^2 - 10.at n=19A201782
• Primes of the form 2*n^2 + 62*n + 29.at n=29A243891
• Primes with repdigit indices (in decimal).at n=30A258433
• Prime numbersat n=4444