A356744 Numbers k such that both k and k+2 have exactly 8 divisors.

40, 54, 102, 128, 136, 152, 182, 184, 230, 246, 248, 374, 424, 470, 472, 534, 582, 663, 710, 806, 822, 824, 854, 872, 902, 904, 999, 1105, 1192, 1256, 1309, 1334, 1336, 1432, 1446, 1526, 1542, 1545, 1576, 1593, 1645, 1686, 1784, 1832, 1864, 1885, 1910, 1928, 2006, 2013

Offset: 1

Author

Jianing Song, Aug 25 2022

Keywords

• nonn

Examples

			54 is a term since 54 and 56 both have 8 divisors.
		

Links

• Jianing Song, Table of n, a(n) for n = 1..10000

Crossrefs

Numbers k such that k and k+2 both have exactly m divisors: A001359 (m=2), A356742 (m=4), A356744 (m=6), this sequence (m=8).

Cf. also A274357 (numbers k such that k and k+1 both have exactly 8 divisors).

Programs

PARI

isA356744(n) = numdiv(n)==8 && numdiv(n+2)==8