38950081

Appears in sequences

• a(n) = (3*n+1)^4.at n=26A016780
• a(n) = (4*n+3)^4.at n=19A016840
• a(n) = (5*n + 4)^4.at n=15A016900
• a(n) = (6*n + 1)^4.at n=13A016924
• a(n) = (7*n + 2)^4.at n=11A017008
• a(n) = (8*n + 7)^4.at n=9A017152
• a(n) = (9*n + 7)^4.at n=8A017248
• a(n) = (10*n + 9)^4.at n=7A017380
• a(n) = (11*n + 2)^4.at n=7A017416
• a(n) = (12*n + 7)^4.at n=6A017608
• a(n) = prime(n)^4.at n=21A030514
• Squares of composite numbers k such that sigma(k) (sum of divisors of k, A000203) is a prime.at n=18A065404
• E.g.f: Sum_{n>=0} 3^(n^2) * exp(-2*3^n*x) * x^n/n!.at n=4A202991
• Numbers of the form p^q^r, for p,q,r primes.at n=29A217709
• a(n) = prime(n)^(prime(n + 1) - prime(n)).at n=21A218460
• Fourth powers whose reversal is a prime.at n=9A253912
• Smallest k such that sigma(k^n) is prime.at n=26A279094
• a(n) is the smallest number k such that sigma(k) and sigma(k^n) are both primes.at n=26A299148
• Lower of a pair of adjacent perfect powers, both with exponents > 2.at n=17A340700