login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A364659 Numbers k such that sigma(k) < sigma(k+1) < sigma(k+2). 5
1, 2, 61, 62, 73, 74, 133, 134, 145, 146, 193, 194, 253, 254, 313, 397, 398, 403, 457, 458, 481, 482, 493, 494, 523, 553, 554, 565, 566, 613, 614, 625, 626, 661, 662, 673, 674, 691, 733, 734, 757, 758, 763, 793, 794, 817, 818, 853, 854, 913, 914, 943, 973, 974, 997, 998 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(PARI) isok(n) = sigma(n)<sigma(n+1) && sigma(n+1)<sigma(n+2);
CROSSREFS
Sequence in context: A101896 A130411 A262079 * A222009 A351728 A336297
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Aug 01 2023
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 1 10:18 EST 2024. Contains 370432 sequences. (Running on oeis4.)