38809

Appears in sequences

• a(n) = (6*n + 5)^2.at n=32A016970
• a(n) = (7*n + 1)^2.at n=28A016994
• a(n) = (8*n + 5)^2.at n=24A017126
• a(n) = (9*n + 8)^2.at n=21A017258
• a(n) = (10*n + 7)^2.at n=19A017354
• a(n) = (11*n + 10)^2.at n=17A017510
• a(n) = (12*n + 5)^2.at n=16A017582
• Numbers k such that k^2 is palindromic in base 14.at n=26A030072
• Squares which are palindromes in base 14.at n=9A030074
• Squares with initial digit '3'.at n=35A045786
• Numbers n such that sigma(d(n^3))==d(sigma(n^2)), where d(n) is the number of divisors of n.at n=16A063797
• Numbers having exactly four anti-divisors.at n=28A066469
• Numbers k such that phi(k)^2+sigma(k)^2 is prime.at n=30A068367
• Smallest composite k such that phi(k) > k*(1-1/n^2).at n=13A069639
• Perfect squares using only the curved digits 0, 3, 6, 8 and 9.at n=8A079655
• Square of primes of the form 4k+1 (A002144).at n=20A080109
• Main diagonal of A082043: a(n) = n^4 + 2*n^2 + 1.at n=14A082044
• Sort the digits of these squares into descending order and drop zeros to get primes.at n=36A082921
• Numbers m such that Sum_{p prime|m} p^r(p) = m, where r(p) is the least positive primitive root of p (A001918).at n=27A101051
• Indices of primes in the sequence defined by A(0) = 21, A(n) = 10*A(n-1) + 31 for n > 0.at n=12A101957