39859

Appears in sequences

• Numbers k such that sum of divisors of k is a square and a triangular number (A000217). That is, numbers k such that A000203(k) is in A001110.at n=13A232847
• Number of compositions of n with exactly six occurrences of the largest part.at n=19A243741
• Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.at n=17A256354
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 865", based on the 5-celled von Neumann neighborhood.at n=32A273701
• Numbers whose septenary, octal and nonary representations are prime when read in decimal.at n=27A281252
• Number of integers of the form (x^4 + y^4) mod 3^n; a(n) = A289559(3^n).at n=10A367484