A364586 a(n) is the least number with exactly n divisors of the form 5*k+1.

1, 6, 36, 66, 252, 336, 672, 1008, 3528, 2016, 4032, 3696, 9072, 7392, 13104, 11088, 36288, 38304, 26208, 22176, 68544, 44352, 91728, 66528, 154224, 99792, 209664, 96096, 301392, 144144, 222768, 188496, 487872, 399168, 471744, 421344, 1079568, 288288, 1097712, 432432

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..100

Prog

(PARI) a(n) = my(k=1); while (sumdiv(k, d, (d%5)==1) != n, k++); k; \\ Michel Marcus, Jul 29 2023
(PARI) list(nmax) = {my(v = vector(nmax), c = 0, k = 1, i); while(c < nmax, i = sumdiv(k, d, d % 5 == 1); if(i <= nmax && v[i] == 0, c++; v[i] = k); k++); v; } \\ Amiram Eldar, Jan 28 2025

Crossrefs

Cf. A001876, A005179, A038547, A364598, A364599, A364600.

Sequence in context: A139249 A070150 A161144 * A119845 A208064 A207929

Adjacent sequences: A364583 A364584 A364585 * A364587 A364588 A364589

Keyword

nonn

Author

Ilya Gutkovskiy, Jul 28 2023

Status

approved