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A077253 Sum of digits squared plus sum of digits of n. 2
2, 6, 12, 20, 30, 42, 56, 72, 90, 2, 4, 8, 14, 22, 32, 44, 58, 74, 92, 6, 8, 12, 18, 26, 36, 48, 62, 78, 96, 12, 14, 18, 24, 32, 42, 54, 68, 84, 102, 20, 22, 26, 32, 40, 50, 62, 76, 92, 110, 30, 32, 36, 42, 50, 60, 72, 86, 102, 120, 42, 44, 48, 54, 62, 72, 84, 98, 114, 132 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Inspired by A071440. The quasi-periodic function. See also A077252.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

a(13)=14 because (1^2+3^2)+(1+3)=14.

MATHEMATICA

sd[n_]:=Module[{idn=IntegerDigits[n]}, Total[idn+idn^2]]; Array[sd, 80] (* Harvey P. Dale, Aug 12 2012 *)

PROG

(PARI) a(n)=my(d=digits(n)); sum(i=1, #d, d[i]^2)+sumdigits(n) \\ Charles R Greathouse IV, Nov 26 2016

CROSSREFS

Cf. A071440, A002378, A077252.

Sequence in context: A102069 A160938 A160926 * A098734 A258881 A160942

Adjacent sequences:  A077250 A077251 A077252 * A077254 A077255 A077256

KEYWORD

nonn,base,easy

AUTHOR

Zak Seidov, Nov 01 2002

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)