54540

Appears in sequences

• Non-palindromic numbers such that either x=q1.Rev[x] or Rev[x]=q2.x, where R[x]=A004086[x] and q1 or q2 are integers not divisible by 10.at n=24A071687
• Numbers n such that n = 12*reversal(n).at n=3A101705
• Numbers n such that n+prime(n) is the square of a prime.at n=11A104911
• Numbers n such that prime(n) + n is a prime power (A246547).at n=19A109314
• Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.at n=28A139408
• Numbers whose carryless sum of divisors is zero.at n=10A323414
• Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=25A328133
• Numbers that are not palindromes even after removing trailing zeros and are divisible by their reverses.at n=28A345361
• Number of integer compositions of n with all distinct run-sums.at n=22A353850
• Expansion of e.g.f. (1/x) * Series_Reversion( x*(1 + log(1-x))^4 ).at n=4A377429
• Expansion of e.g.f. exp(Sum_{k>=1} phi(k)^4 * x^k/k), where phi is the Euler totient function A000010.at n=6A377509