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A160943 a(n) = n + digital sum(n-1) + digital sum(n+1). 1
3, 6, 9, 12, 15, 18, 21, 24, 18, 21, 15, 18, 21, 24, 27, 30, 33, 36, 30, 33, 27, 30, 33, 36, 39, 42, 45, 48, 42, 45, 39, 42, 45, 48, 51, 54, 57, 60, 54, 57, 51, 54, 57, 60, 63, 66, 69, 72, 66, 69, 63, 66, 69, 72, 75, 78, 81, 84, 78, 81, 75, 78, 81, 84, 87, 90, 93, 96, 90, 93 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = n + A007953(n-1) + A007953(n+1)
EXAMPLE
a(8) = 8 +ds(7) +ds(9) = 7+8+9 = 24;
a(15) = 15+ds(14)+ds(16) = 15+5+7 = 27;
a(26) = 26+ds(25)+ds(27) = 26+7+9 = 42.
MATHEMATICA
Table[n+Total[IntegerDigits[n-1]]+Total[IntegerDigits[n+1]], {n, 70}] (* Harvey P. Dale, Jun 24 2011 *)
PROG
(Python)
def A160943(n): return n+sum(int(d) for d in str(n-1))+sum(int(d) for d in str(n+1)) # Chai Wah Wu, Mar 11 2021
(PARI) a(n) = n + sumdigits(n-1) + sumdigits(n+1); \\ Michel Marcus, Mar 11 2021
CROSSREFS
Sequence in context: A119888 A305495 A003252 * A160930 A212662 A342831
KEYWORD
nonn,base
AUTHOR
Claudio Meller, May 30 2009
STATUS
approved

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Last modified June 18 17:45 EDT 2024. Contains 373483 sequences. (Running on oeis4.)