458329

Appears in sequences

• a(0) = 0; for n > 0, a(n) = (a(n-1) + 1)^2.at n=5A004019
• Numbers whose sum of divisors is prime.at n=26A023194
• a(n) = prime^2 and digits of prime do not appear in a(n).at n=26A030088
• Squares-of-primes in which no two adjacent digits have the same parity.at n=21A030146
• Odd squares in which parity of digits alternates.at n=31A030156
• Composite numbers whose prime factors contain no digits other than 6 and 7.at n=18A036322
• Start with 1; square; add 2; subtract 1; repeat.at n=13A059417
• Square array read by antidiagonals with T(n,k)=T(n,k-1)^2+n*T(n,k-1)+1 and T(n,0)=0.at n=30A060136
• Squares with property that digits alternate in parity individually as well as in concatenation with previous terms.at n=23A068888
• Smallest composite k such that phi(k) > k*(1-1/n^2).at n=25A069639
• Numbers n such that n and sigma(n) are prime powers (of the form p^k, p prime, k>=1).at n=33A071114
• Main diagonal of A082043: a(n) = n^4 + 2*n^2 + 1.at n=26A082044
• Numbers k for which Ramanujan's function tau(k)=A000594(k) is an odd prime.at n=1A135430
• Number of subtrees of a complete binary tree.at n=31A157679
• Odd numbers N for which numerator(sigma(N)/N) is a prime.at n=21A193065
• Numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.at n=17A237613
• Odd numbers with prime sum of divisors.at n=19A278911
• Numbers n such that the number of divisors of sum of divisors of n is prime.at n=36A281882
• Numbers m such that m! / sigma(m) is not an integer.at n=27A325436
• Maximal number of root ancestral configurations among matching gene trees and species trees with n leaves.at n=31A355108