30000001

Properties

Appears in sequences

• Numbers k such that k^2+k+7 is a palindrome.at n=20A027722
• Start with the prime 11; next prime must exceed previous prime and start with last digit of previous prime.at n=17A054262
• a(1) = 2; a(n+1) = smallest prime > a(n) with leading digit equal to final digit of a(n).at n=17A061448
• Primes whose sum of digits is 4.at n=22A062339
• Smallest prime in which the n-th significant digit is a 3.at n=7A069589
• Largest n-digit prime with minimum digit sum.at n=7A069664
• Smallest prime == 1 mod (10^n).at n=6A070854
• a(1) = 2. Then the smallest n-digit prime starting with the last digit of the previous term.at n=7A077203
• 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=22A098408
• Happy primes of the form a*10^k + b with single-digit a and b, a > 0, k > 0.at n=30A109902
• Primes in increasing order with most significant digit following the cyclic pattern 2,3,5,7,2,3,5,7,2,3,5,7,...at n=29A113611
• Primes sorted on digit sums, then on the primes.at n=26A157715
• a(n) = 3*10^n + 1.at n=7A199683
• Smallest prime that does not divide at least one n-digit zeroless pandigital number.at n=4A216203
• Primes of the form 3*10^k + 1.at n=2A259866
• List of pairs (p, q) of twin primes with distinct leading digits.at n=15A366679
• Prime numbersat n=1857860