A061746 a(0) = 1; a(n) is obtained by incrementing each digit of a(n-1) by 7.

1, 8, 15, 812, 1589, 8121516, 1589812813, 8121516158915810, 158981281381215168121587, 8121516158915810158981281315898121514, 158981281381215168121587812151615891581081215161589812811

Offset

0,2

Comments

In A061511-A061522, A061746-A061750 when the incremented digit exceeds 9 it is written as a 2-digit string. So 9+1 becomes the 2-digit string 10, etc.

Considering each term as a sequence of digits, the subsequences a(2n) and a(2n-1) converge to two different fixed points of the operation repeated twice, 158981281381... and 81215161589158.... - M. F. Hasler, Jun 24 2016

Links

Table of n, a(n) for n=0..10.

Prog

(PARI) A061746(n=1, a=1, m=7)={for(n=1, n, a=eval(concat(apply(t->Str(t+m), digits(a))))); a} \\ If only the 2nd argument is given, then the operation is applied once to that argument. - M. F. Hasler, Jun 24 2016

Crossrefs

Cf. A061747 - A061750, A061511 - A061522; A061581 - A061587.

Sequence in context: A190901 A066916 A131446 * A028585 A073926 A073925

Adjacent sequences: A061743 A061744 A061745 * A061747 A061748 A061749

Keyword

base,nonn

Author

Amarnath Murthy, May 08 2001

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), May 11 2001

Status

approved