23111

Appears in sequences

• a(n) = floor(n*phi^18), where phi is the golden ratio, A001622.at n=4A004933
• a(n) = a(n-1) + a(n-2) + 1 for n>1, a(0)=3, a(1)=11.at n=17A022410
• Numbers k such that k^2+k+3 is a palindrome.at n=15A027714
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 37 ones.at n=4A031805
• Composite numbers whose prime factors contain no digits other than 1 and 9.at n=19A036309
• Denominators of continued fraction convergents to sqrt(157).at n=13A041289
• Denominators of continued fraction convergents to sqrt(628).at n=9A042205
• n written efficiently in natural numbers base, i.e., in form ...wxyz where n = 1*z + 2*y + 3*x + 4*w + ... with z <= 1, y < 2, x < 3, w < 4, ...at n=27A055611
• Numbers divisible by the sum of factorials of their digits [A061602(n)] and also terminate in the sum of factorials of their digits.at n=17A071064
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.at n=8A150238
• Composite numbers whose product of digits is 6.at n=33A201055
• Numbers that eventually reach 1 under "x -> sum of 4th power of digits of x".at n=20A219111
• Number of nX3 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=18A317768
• Incrementally largest values of minimal y satisfying the equation x^2 - D*y^2 = 3, where D is a prime number.at n=3A336800
• Irregular triangle read by rows, in which row n lists the computation of the tag system T_C(3,2) with alphabet {1, 2, 3}, deletion number 2, and production rules 1 -> 23, 2 -> 1, 3 -> 111, when started from the word encoding n.at n=21A351849