23419

Appears in sequences

• Numbers k where cos(k) decreases monotonically to 0.at n=36A046957
• Numbers k where sin(k) increases monotonically to 1 (or cosec(k) decreases).at n=40A046959
• 10000n+1, 10000n+3, 10000n+7, 10000n+9 are all primes.at n=12A064963
• Number of compositions of n with parts in N which avoid the pattern 221.at n=16A134044
• 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, 1, 0), (0, 0, -1), (1, 0, 0), (1, 1, 0)}.at n=8A150327
• Composite numbers and 1 which yield a prime whenever a 3 is inserted anywhere in them (including at the beginning or end).at n=25A216166
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 525", based on the 5-celled von Neumann neighborhood.at n=28A272740
• Semiprimes whose binary and ternary representations are prime when read in decimal.at n=27A279052
• Sum of the largest parts of all compositions of n into distinct parts.at n=21A336903