21978022

Appears in sequences

• Numbers k which when sandwiched between two 2's give a multiple of k.at n=20A116437
• Numbers k which when sandwiched between two 4's give a multiple of k.at n=29A116439
• Numbers k which when sandwiched between two 6's give a multiple of k.at n=37A116441
• Numbers k which when sandwiched between two 8's give a multiple of k.at n=34A116443