A364600 a(n) is the least number with exactly n divisors of the form 5*k+4.

1, 4, 24, 72, 144, 432, 504, 1008, 1512, 3528, 3024, 7056, 5544, 14112, 11088, 13104, 16632, 26208, 36288, 63504, 33264, 68544, 77616, 127008, 66528, 154224, 155232, 209664, 133056, 222768, 144144, 301392, 216216, 853776, 288288, 471744, 399168, 825552, 698544, 1707552, 432432

Offset: 0

Author

Ilya Gutkovskiy, Jul 29 2023

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 0..100

Crossrefs

Cf. A001899, A005179, A038547, A364586, A364598, A364599.

Programs

PARI

list(nmax) = {my(v = vector(nmax+1), c = 0, k = 1, i); while(c < nmax+1, i = sumdiv(k, d, d % 5 == 4) + 1; if(i <= nmax+1 && v[i] == 0, c++; v[i] = k); k++); v;} \\ Amiram Eldar, Jan 28 2025