84215045

Appears in sequences

• Lerch's function q_2(n) = (2^{phi(t)} - 1)/t where t = 2*n - 1.at n=25A001226
• Sierpiński's triangle (Pascal's triangle mod 2) converted to decimal.at n=26A001317
• Divisors of 2^32 - 1 (for a(1) to a(31), the 31 regular polygons with an odd number of sides constructible with ruler and compass).at n=26A004729
• One-dimensional cellular automaton 'sigma-minus' (Rule 90): 000,001,010,011,100,101,110,111 -> 0,1,0,1,1,0,1,0.at n=13A038183
• Odd values of n for which a regular n-gon can be constructed by compass and straightedge.at n=25A045544
• Smallest number whose Euler totient is divisible by 2^n.at n=26A053576
• Modulo 2 binomial transform of the Jacobsthal numbers J(n).at n=27A100745
• A modular binomial sum transform of 2^n.at n=28A101692
• A modular binomial sum transform of 2^n.at n=44A101692
• A modular binomial sum transform of 2^n.at n=30A101693
• Numbers of the form A001317(t), excluding those at places of the form t=m*(2^k-1), m>=0, k>=2.at n=15A177960
• Distinct numbers appearing in A212200 in their order of appearance.at n=18A212203
• Least k such that phi(k) has exactly n prime factors (counted with multiplicity).at n=25A275969