61483

Properties

Appears in sequences

• 4th powers written backwards.at n=13A002108
• Largest prime p==3 (mod 8) such that Q(sqrt(-p)) has class number 2n+1.at n=10A002149
• Primes whose reversal is a square.at n=17A007488
• Largest squarefree number k such that Q(sqrt(-k)) has class number n.at n=20A038552
• Numbers k such that 171*2^k-1 is prime.at n=37A050837
• Primes whose reversal is a fourth power.at n=1A058996
• Primes whose digit reversal is a nontrivial power.at n=20A069798
• Concatenating n with n+1 (in base 10) gives a number which is the product of 2 palindromes.at n=31A113942
• Prime numbers whose digit reversal is a powerful(1) number (A001694).at n=29A115685
• Same as A007488, but with the numbers arranged so that their reversals are in increasing order.at n=18A132388
• First primes beginning a chain of 4 primes indexed equidistantly (n-th, (n+b)-th, (n+2b)-th, (n+3b)-th primes) whose sum of squares is the square of two times a prime and with b <= n.at n=38A214265
• Primes whose base-3 representation also is the base-2 representation of a prime.at n=46A235265
• Primes p for which p^i + 4 is prime for i = 1, 3 and 5.at n=8A243780
• a(n) is the least integer k such that 1/(Sum_{j=1..n} 1/phi(k*j)) is an integer.at n=27A341810
• Largest number k such that C(-k) is the cyclic group of order n, where C(D) is the class group of the quadratic field with discriminant D; or 0 if no such k exists.at n=20A357600
• Least prime p such that the sum of 2i - 1 consecutive primes starting with p is prime for each i <= n and not prime for i = n+1, and -1 if no such prime exists.at n=7A370111
• Prime numbersat n=6184