3000001

Appears in sequences

• Liponombres: numbers whose French name does not contain the letter "e".at n=26A014254
• Numbers k such that k^2+k+7 is a palindrome.at n=18A027722
• Numbers whose square contains the same digit more than 2/3 of the time and does not end in 0.at n=28A039820
• Let P(i) = i-th prime. To get a(n), factor P(n)-1 as a product of primes, then concatenate the exponents.at n=32A097463
• a(1) = 1; for n>1, a(n) = smallest number > a(n-1) such that last digit of a(n-1) + first digit of a(n) = 3.at n=19A098408
• a(n) = 3*10^n + 1.at n=6A199683
• Number of 2 X n arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.at n=10A221829
• Semiprimes with sum of digits 4.at n=32A382073