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 A107974 First differences give the same sequence written as a string of individual digits. 5
 3, 6, 12, 13, 15, 16, 19, 20, 25, 26, 32, 33, 42, 44, 44, 46, 51, 53, 59, 62, 64, 67, 70, 74, 76, 80, 84, 88, 92, 96, 102, 107, 108, 113, 116, 121, 130, 136, 138, 144, 148, 154, 161, 168, 168, 175, 179, 186, 192, 200, 200, 208, 212, 220, 228, 237, 239, 248, 254, 255 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 3.6.12.13.15.16.19.20.25 ... <- sequence .3.6..1..2..1..3..1..5 ... <- first differences are the sequence's digits. MATHEMATICA a[1] = 3; a[n_] := a[n] = a[n - 1] + Flatten[ Table[ IntegerDigits[ a[i]], {i, n - 1}]][[n - 1]]; Table[ a[n], {n, 60}] (* Robert G. Wilson v, Jun 15 2005 *) CROSSREFS Cf. A100787, A107974, A107975, A107976, A107977 for "seeds" 1, 3, 5, 7 and 9. Sequence in context: A038587 A090553 A078502 * A298879 A116625 A287560 Adjacent sequences:  A107971 A107972 A107973 * A107975 A107976 A107977 KEYWORD base,easy,nonn AUTHOR Eric Angelini, Jun 12 2005 EXTENSIONS Edited and extended by Robert G. Wilson v, Jun 15 2005 STATUS approved

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Last modified January 22 04:27 EST 2020. Contains 331133 sequences. (Running on oeis4.)