

A367612


Numbers that are the commachild of exactly one positive number.


2



11, 12, 22, 23, 24, 33, 34, 35, 36, 44, 45, 46, 47, 48, 55, 56, 57, 58, 59, 60, 61, 66, 67, 68, 69, 70, 71, 72, 73, 77, 78, 79, 80, 81, 82, 83, 84, 85, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122
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OFFSET

1,1


COMMENTS

See A367338 for definition of commachild.
May also be called numbers that have a positive commapredecessor.


LINKS

Eric Angelini, Michael S. Branicky, Giovanni Resta, N. J. A. Sloane, and David W. Wilson, The Comma Sequence: A Simple Sequence With Bizarre Properties, arXiv:2401.14346, Youtube


PROG

(Python)
def ok(n): y = int(str(n)[0]); x = (ny)%10; return n  y  10*x > 0


CROSSREFS



KEYWORD

nonn,base


AUTHOR



STATUS

approved



