A299979 -id:A299979 - cp's OEIS frontend

A299976 Lexicographic first sequence of positive integers such that a(n) + a(n+1) has a digit 6, and no term occurs twice.

1, 5, 11, 15, 21, 25, 31, 29, 7, 9, 17, 19, 27, 33, 3, 13, 23, 37, 24, 2, 4, 12, 14, 22, 34, 26, 10, 6, 20, 16, 30, 32, 28, 8, 18, 38, 48, 58, 68, 78, 82, 44, 42, 54, 52, 64, 62, 74, 72, 84, 76, 40, 36, 50, 46, 60, 56, 70, 66, 80, 81, 35, 41, 45, 51, 55, 61, 65, 71, 75, 85, 77, 39, 47, 49, 57, 59, 67, 69, 87, 73, 43, 53, 63, 83, 79, 86, 90, 96, 100

Offset: 1

M. F. Hasler and Eric Angelini, Feb 22 2018

A permutation of the positive integers.

Cf. A299986 (analog with nonnegative terms), A299957 (analog with digit 1), A299971, A299972, ..., A299979 (digit 0, 2, ..., 9).

a(n,f=1,d=6,a=1,u=[a])={for(n=2,n,f&&if(f==1,print1(a","),write(f,n-1," "a));for(k=u[1]+1,oo,setsearch(u,k)&&next;setsearch(Set(digits(a+k)),d)&&(a=k)&&break);u=setunion(u,[a]);u[2]==u[1]+1&&u=u[^1]);a}

A299977 Lexicographic first sequence of positive integers such that a(n) + a(n+1) has a digit 7, and no term occurs twice.

Original entry on oeis.org

1, 6, 11, 16, 21, 26, 31, 36, 34, 3, 4, 13, 14, 23, 24, 33, 37, 10, 7, 20, 17, 30, 27, 40, 32, 5, 2, 15, 12, 25, 22, 35, 38, 9, 8, 19, 18, 29, 28, 39, 48, 49, 58, 59, 68, 69, 78, 79, 88, 82, 45, 42, 55, 52, 65, 62, 75, 72, 85, 86, 41, 46, 51, 56, 61, 66, 71, 76, 81, 89, 83, 44, 43, 54, 53, 64, 63, 74, 73, 84, 87, 50, 47, 60, 57, 70, 67, 80, 77, 90, 97

Offset: 1

M. F. Hasler and Eric Angelini, Feb 22 2018

A permutation of the positive integers.

Cf. A299987 (analog with nonnegative terms), A299957 (analog with digit 1), A299971, A299972, ..., A299979 (digit 0, 2, ..., 9).

a(n,f=1,d=7,a=1,u=[a])={for(n=2,n,f&&if(f==1,print1(a","),write(f,n-1," "a));for(k=u[1]+1,oo,setsearch(u,k)&&next;setsearch(Set(digits(a+k)),d)&&(a=k)&&break);u=setunion(u,[a]);u[2]==u[1]+1&&u=u[^1]);a}

cp's OEIS Frontend

A299976 Lexicographic first sequence of positive integers such that a(n) + a(n+1) has a digit 6, and no term occurs twice.

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