This site is supported by donations to The OEIS Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A244991 Numbers whose greatest prime factor is a prime with an odd index; n such that A006530(n) is in A031368. 9
 2, 4, 5, 8, 10, 11, 15, 16, 17, 20, 22, 23, 25, 30, 31, 32, 33, 34, 40, 41, 44, 45, 46, 47, 50, 51, 55, 59, 60, 62, 64, 66, 67, 68, 69, 73, 75, 77, 80, 82, 83, 85, 88, 90, 92, 93, 94, 97, 99, 100, 102, 103, 109, 110, 115, 118, 119, 120, 121, 123, 124, 125, 127, 128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Equally, numbers n for which A061395(n) is odd. A122111 maps each one of these numbers to a unique term of A026424 and vice versa. LINKS Antti Karttunen, Table of n, a(n) for n = 1..10001 FORMULA For all n, A244989(a(n)) = n. PROG (Scheme, with Antti Karttunen's IntSeq-library) (define A244991 (MATCHING-POS 1 1 (COMPOSE odd? A061395))) CROSSREFS Complement: A244990. Cf. A006530, A026424, A031368, A061395, A122111, A244989, A244321, A244322. Sequence in context: A289058 A102798 A247886 * A004612 A066208 A169743 Adjacent sequences:  A244988 A244989 A244990 * A244992 A244993 A244994 KEYWORD nonn AUTHOR Antti Karttunen, Jul 21 2014 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 January 15 19:17 EST 2019. Contains 319171 sequences. (Running on oeis4.)