A356132 Least integer with n pentagonal divisors.

1, 5, 35, 70, 210, 420, 2310, 4620, 18480, 32340, 60060, 120120, 240240, 720720, 1261260, 1141140, 2042040, 4084080, 4564560, 13693680, 19399380, 58198140, 95855760, 38798760, 116396280, 193993800, 77597520, 232792560, 543182640, 387987600, 1125164040

Offset: 1

Author

Michel Marcus, Jul 27 2022

Keywords

• nonn

Links

• Rémy Sigrist, C program

Crossrefs

Cf. A000326, A130317, A279497.

Programs

C

See Links section.

PARI

a(n) = my(k=1); while (sumdiv(k, d, ispolygonal(d, 5)) != n, k++); k;

Extensions

More terms from Rémy Sigrist, Jul 27 2022