A364600 -id:A364600 - cp's OEIS frontend

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

Ilya Gutkovskiy, Jul 28 2023

nonn

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

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

a(n) = my(k=1); while (sumdiv(k, d, (d%5)==1) != n, k++); k; \\ Michel Marcus, Jul 29 2023

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

A364598 a(n) is the least number with exactly n divisors of the form 5*k+2.

Original entry on oeis.org

1, 2, 12, 42, 84, 252, 462, 672, 924, 2016, 2772, 4032, 5544, 9072, 7392, 17136, 14784, 26208, 22176, 34272, 33264, 52416, 44352, 119952, 66528, 117936, 99792, 183456, 125664, 222768, 188496, 235872, 199584, 487872, 288288, 616896, 399168, 1206576, 376992, 1097712, 432432

Offset: 0

Ilya Gutkovskiy, Jul 29 2023

nonn

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

Cf. A001877, A005179, A038547, A364586, A364599, A364600.

list(nmax) = {my(v = vector(nmax+1), c = 0, k = 1, i); while(c < nmax+1, i = sumdiv(k, d, d % 5 == 2) + 1; if(i <= nmax+1 && v[i] == 0, c++; v[i] = k); k++); v;} \\ Amiram Eldar, Jan 28 2025

A364599 a(n) is the least number with exactly n divisors of the form 5*k+3.

Original entry on oeis.org

1, 3, 18, 48, 144, 288, 504, 1248, 1008, 2016, 3024, 4368, 5544, 14112, 12096, 17136, 11088, 34272, 22176, 26208, 33264, 52416, 48048, 91728, 66528, 117936, 155232, 183456, 133056, 235872, 188496, 222768, 144144, 528528, 376992, 616896, 421344, 825552, 288288, 1707552, 432432

Offset: 0

Ilya Gutkovskiy, Jul 29 2023

nonn

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

Cf. A001878, A005179, A038547, A364586, A364598, A364600.

list(nmax) = {my(v = vector(nmax+1), c = 0, k = 1, i); while(c < nmax+1, i = sumdiv(k, d, d % 5 == 3) + 1; if(i <= nmax+1 && v[i] == 0, c++; v[i] = k); k++); v;} \\ Amiram Eldar, Jan 28 2025

cp's OEIS Frontend

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

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A364598 a(n) is the least number with exactly n divisors of the form 5*k+2.

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A364599 a(n) is the least number with exactly n divisors of the form 5*k+3.

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