22875

Appears in sequences

• a(1)=1; for n > 1, a(n) = 7*a(n-1) + n.at n=5A014830
• Metadromes: digits in base 7 are in strict ascending order.at n=63A023776
• Largest metadrome (number with digits in strict ascending order) in base n.at n=6A023811
• Take the first n numbers written in base 7, concatenate them, then convert from base 7 to base 10.at n=5A048439
• Revert transform of 2*x*(1 - x + x^2 - x^3)-x/(1+x).at n=12A049173
• The first n digits of the juxtaposition of the base-7 numbers converted to decimal.at n=5A055148
• Number of planar partitions that are not corners.at n=17A115982
• Number of integers k < 10^n such that k*(k+1)-1 and k*(k+3)-1 are both first of twin primes.at n=8A138301
• G.f.: [Sum_{n>=0} x^(n*(n+1)/2) * (1+x)^n ]^3.at n=37A182152
• Numbers n such that n!10 + 2 is prime.at n=49A204657
• a(n) = sum of all divisors of all positive integers <= prime(n).at n=38A244583
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7.at n=8A252551
• Irregular array by rows: A(n,m) is the least number which gives a number containing all nonzero digits when multiplied by m-th repunit for base n; each row is truncated when reaches its stationary point.at n=11A277058
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)(1 - 2 S).at n=10A291229
• Numbers k such that 2^k + 5*k is a prime.at n=20A299642
• Expansion of (1/(1 - x)) * Product_{k>=1} 1/(1 + (-x)^k/(1 - x)^k).at n=14A307264