The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A325511 Numbers whose prime signature is that of a factorial number. 2
 1, 2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 24, 26, 29, 31, 33, 34, 35, 37, 38, 39, 40, 41, 43, 46, 47, 51, 53, 54, 55, 56, 57, 58, 59, 61, 62, 65, 67, 69, 71, 73, 74, 77, 79, 82, 83, 85, 86, 87, 88, 89, 91, 93, 94, 95, 97, 101, 103, 104, 106 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A181819(a(n)) belongs to A325508. LINKS EXAMPLE The sequence of terms together with their prime indices begins:    1: {}    2: {1}    3: {2}    5: {3}    6: {1,2}    7: {4}   10: {1,3}   11: {5}   13: {6}   14: {1,4}   15: {2,3}   17: {7}   19: {8}   21: {2,4}   22: {1,5}   23: {9}   24: {1,1,1,2}   26: {1,6}   29: {10}   31: {11} MATHEMATICA Select[Range[30], MemberQ[Table[Sort[Last/@FactorInteger[k!]], {k, #}], Sort[Last/@FactorInteger[#]]]&] CROSSREFS Cf. A000142, A011371, A022559, A076934, A115627, A181819, A325272, A325276, A325508, A325509, A325510. Sequence in context: A064052 A248792 A064594 * A240370 A193304 A333634 Adjacent sequences:  A325508 A325509 A325510 * A325512 A325513 A325514 KEYWORD nonn AUTHOR Gus Wiseman, May 08 2019 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 12 02:06 EDT 2021. Contains 343808 sequences. (Running on oeis4.)