2097149

Appears in sequences

• a(n) = 2^n - 3.at n=21A036563
• New record highs reached in A060030.at n=39A060482
• Triangle read by rows in which the n-th row contains n distinct numbers whose sum is n^n. The numbers are terms of an arithmetic progression with a common difference 1 or 2 respectively accordingly as n is odd or even.at n=30A080524
• Smallest number having in binary representation a prefix of length n that is also a suffix of its successor.at n=20A091270
• Semiprime nearest to 2^n. (In case of a tie, choose the smaller).at n=21A117405
• a(n) = 3*a(n-1) - 3*a(n-2) + 2*a(n-3), with a(0) = 4, a(1) = 2, a(2) = 1.at n=21A133455
• a(n) = a(n-1) + 2*a(n-2) - 2*a(n-3).at n=38A136252
• Powers of 2 with 3 alternatingly added and subtracted.at n=21A140657
• a(n) = 2^n +(-1)^n - 2.at n=21A166956
• a(n) = ADPE(n) is the total number of aperiodic k-double-palindromes of n up to cyclic equivalence, where 1 <= k <= n.at n=40A181314
• Expansion of (1+2x)*(1+2*x^2)/((1-x)*(1+x)*(1-2*x^2)).at n=38A185647
• Irregular array read by rows in which row n lists the positive integers k in ascending order for which 1 is in a primitive cycle of n positive integers under iteration by the Collatz-like 3x+k function.at n=41A226618
• Decimal representation of the n-th iteration of the "Rule 243" elementary cellular automaton starting with a single ON (black) cell.at n=10A267921
• a(n) = 2^n + 2*(-1)^n - 1.at n=21A269019
• a(n) = Numerator of (0 followed by 1's) - n/2^n.at n=24A273153
• Expansion of x*(1 - 2*x + 3*x^2)/((1 - x)*(1 - 2*x)*(1 - x + x^2)).at n=21A282153
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 621", based on the 5-celled von Neumann neighborhood.at n=21A283358
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 637", based on the 5-celled von Neumann neighborhood.at n=21A283407
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 641", based on the 5-celled von Neumann neighborhood.at n=20A283506
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 950", based on the 5-celled von Neumann neighborhood.at n=20A284482